drop off

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Collins Concise English Dictionary © HarperCollins Publishers::
drop off vb (adverb)
  1. (intransitive) to grow smaller or less; decline
  2. (transitive) to allow to alight; set down
  3. (intransitive) informal to fall asleep
n drop-off
  1. a steep or vertical descent
  2. a sharp decrease
WordReference Random House Learner's Dictionary of American English © 2020
ˈdrop-ˌoff,  n. [countable]
  1. a vertical or very steep descent:a drop-off of about one hundred feet.
  2. a decline;
    decrease:an unusual drop-off in sales.
  3. a place where a person or thing can be left, received, accepted, etc.:the taxi drop-off at the airport.

WordReference Random House Learner's Dictionary of American English © 2020
drop /drɑp/USA pronunciation   n., v.,  dropped, drop•ping. 
n. [countable]
  1. a small amount of liquid produced in a globule:A few drops of blood fell from the cut on her hand.
  2. a very small amount of liquid:to have a drop of tea.
  3. a very small quantity of anything:not even a drop of mercy.
  4. DrugsUsually,  drops. [plural] liquid medicine given from a medicine dropper, such as a solution for the eyes.
  5. a limited amount of an alcoholic beverage:He takes a drop after dinner.
  6. an act or instance of dropping;
    fall;
    descent:The sudden drop startled the airplane's passengers.
  7. the distance or depth to which anything drops:a drop of ten feet.
  8. a steep slope:It's a short drop to the lake.
  9. a decline in amount:The stock market saw a drop of about fifty points.
  10. a small, ball-shaped piece of candy:Share the lemon drops with your sister.
  11. a central place where items are left or delivered:She sent her manuscript to the mail drop.
  12. an instance of dropping persons or supplies by parachute or the amount or number dropped.

v. 
  1. to (cause to) fall in globules such as water: [no object]Water dropped from the ceiling onto the floor.[+ object]He dropped some cream into his coffee.
  2. to (cause to) fall vertically;
    (cause to) have an abrupt descent: [no object]The fruit dropped off the tree.[+ object]He dropped a few coconuts down to us.
  3. to (cause to) sink or fall to the ground, floor, or bottom: [no object]He dropped to his knees and prayed.[+ object]He dropped his opponent with one punch.
  4. to (cause to) fall lower in condition;
    diminish or lessen;
    reduce: [no object]Prices dropped in the spring.[+ object]The store dropped its prices, but sales didn't increase.
  5. to (cause to) come to an end;
    stop;
    cease;
    lapse: [no object]There the matter dropped.[+ object]We dropped the matter.
  6. to fall or move to a position that is lower, farther back, inferior, etc.: [no object]to drop back in line.[+ object]That loss dropped the team from the playoffs.
  7. to withdraw (from);
    quit: [+ object]He dropped history and English.[+ out of + object]to drop out of a race.See drop out below.
  8. to pass or enter without effort into an activity or the like:[+ into + object]to drop into a deep sleep.
  9. to make an unexpected visit at a place:[+ in/by/over]We were in the neighborhood so we thought we'd just drop in to see you.
  10. to cease to appear or be seen;
    vanish:[no object]to drop from sight.
  11. Slang Termsto swallow (an illegal drug):[+ object]They dropped some acid.
  12. to utter or express casually or incidentally:[+ object]to drop a hint.
  13. to write and send: [+ object + to + object]Why not drop a note to her?[+ object + object]Drop me a note.
  14. to set down or unload, such as from a ship or car: [+ object]Drop us at the corner.[+ object + off]Can you drop us off at the corner?[+ off + object]We dropped off the family at the train station.
  15. Phonetics to leave out or omit (a letter) in speaking:[+ object]You drop your finalr's.
  16. to (cause to) lower (the voice) in pitch or loudness: [no object]His voice dropped as he approached.[+ object]He dropped his voice to a whisper.
  17. to abandon;
    forget:[+ object]to drop one's old friends.
  18. to dismiss (an employee, etc.);
    remove:[+ object + from + object]to drop a consultant from the payroll.
  19. to lose (a game, etc.):[+ object]He dropped fifty dollars on that horse race.
  20. [+ object] to parachute (persons, etc.).
  21. Clothing to resew in a lower position:[+ object]to drop the hem of a skirt.
  22. drop behind, [no object] to fail to keep maintaining the necessary pace, etc.:With all her other activities she was dropping behind at school.
  23. drop off, [no object]
    • to fall asleep:She drops off at about eleven each night.
    • to decrease;
      decline:Prices began to drop off significantly.
  24. drop out, [no object]
    • to stop attending school or college:I haven't seen that student of mine; do you think she's dropped out?
    • to leave or reject the customs, etc., of society in favor of pursuing one's own lifestyle:He just dropped out and went to Tahiti.
Idioms
  1. Idiomsat the drop of a hat, for the smallest reason and without delay:to argue at the drop of a hat.
  2. Idiomsdrop in the bucket, a very small, insignificant amount:What's a few million dollars at this point? A drop in the bucket.


WordReference Random House Unabridged Dictionary of American English © 2020
drop-off  (dropôf′, -of′),USA pronunciation n. 
  1. a vertical or very steep descent:The trail has a drop-off of several hundred feet.
  2. a decline;
    decrease:Sales have shown a considerable drop-off this year.
  3. a place where a person or thing can be left, received, accommodated, etc.:a new drop-off for outpatients.

adj. 
  1. applied when a rented vehicle is left elsewhere than at the point of hire:to pay a drop-off charge.
  • noun, nominal, adjective, adjectival use of verb, verbal phrase drop off 1955–60

WordReference Random House Unabridged Dictionary of American English © 2020
drop  (drop),USA pronunciation n., v.,  dropped  or dropt, drop•ping. 
n. 
  1. a small quantity of liquid that falls or is produced in a more or less spherical mass;
    a liquid globule.
  2. the quantity of liquid contained in such a globule.
  3. a very small quantity of liquid:I'll have a little more tea, just a drop.
  4. a minute quantity of anything:not even a drop of mercy.
  5. DrugsUsually,  drops. 
    • liquid medicine given in a dose or form of globules from a medicine dropper.
    • a solution for dilating the pupils of the eyes, administered to the eyes in globules by a medicine dropper.
  6. a limited amount of an alcoholic beverage:He occasionally takes a drop after dinner.
  7. an act or instance of dropping;
    fall;
    descent.
  8. the distance or depth to which anything drops:a ten-foot drop to the ground.
  9. a steep slope:a short drop to the lake.
  10. a decline in amount, degree, quality, value, etc.:a drop in prices.
  11. a small, usually spherical, piece of candy;
    lozenge:a lemon drop.
  12. a central depository where items are left or transmitted:a mail drop.
  13. a predesignated place where secret letters or packages can be left to be picked up by another person without attracting attention, as in espionage or drug dealing.
  14. something resembling or likened to a liquid globule, as certain ornaments, a spherical earring, etc.
  15. a pendant.
  16. a descent by parachute.
  17. an instance of dropping supplies by parachute or an amount of supplies so dropped.
  18. something that drops or is used for dropping.
  19. a group of persons dropped by parachute, as the personnel dropped by parachute during one military action.
  20. Show Business[Theat.]
    • See  drop curtain. 
    • See  drop scene. 
  21. See  trap door. 
  22. a gallows.
  23. a slit or opening into which something can be dropped, as in a mailbox.
  24. Games(in a casino) the income from the sale of chips.
  25. a small flag, usually of enameled metal, that gives a visual signal in an annunciator.
  26. Furniturean applied ornament resembling a pendant.
  27. Architecturegutta (def. 2).
  28. Nautical, Naval Termsthe vertical dimension amidships of any sail that is bent to a standing yard. Cf. hoist (def. 7a).
  29. BuildingAlso called  drop panel. (in reinforced-concrete-slab construction) a thickened portion of the ceiling around a column head.
  30. Time[Horol.]the free motion of an escape wheel between successive checks by the pallet.
  31. the newborn young of an animal.
  32. Idiomsat the drop of a hat, at the slightest provocation or without delay:He's ready to fight at the drop of a hat.
  33. Idiomsdrop in the bucket. See  bucket (def. 9).
  34. Idiomsget or  have the drop on: 
    • to aim and be ready to shoot a gun at an antagonist before the other person's gun can be drawn.
    • to get or have at a disadvantage.

v.i. 
  1. to fall in globules or small portions, as water or other liquid:Rain drops from the clouds.
  2. to fall vertically;
    have an abrupt descent.
  3. to sink or fall to the ground, floor, or bottom as if inanimate.
  4. to fall lower in condition, degree, value, etc.;
    diminish or lessen;
    sink:The prices dropped sharply.
  5. to come to an end;
    cease;
    lapse:There the matter dropped.
  6. to fall or move to a position that is lower, farther back, inferior, etc.:to drop back in line; to drop to the rear.
  7. to withdraw;
    quit (often fol. by out or from):to drop out of a race; to drop from a game.
  8. to pass or enter without effort into some condition, activity, or the like:to drop into sleep; to drop into a habit.
  9. to make an unexpected or unannounced stop at a place;
    pay an informal visit or call (usually fol. by in, by, or over):Since we're in the neighborhood, why don't we drop in at my brother's?
  10. to cease to appear or be seen;
    vanish:to drop from sight or notice.
  11. to fall wounded, dead, etc.:A thousand men dropped in the battle.
  12. Sportto squat or crouch, as a dog at the sight of game.
  13. to move gently, as with the tide or a light wind (usually fol. by down).
  14. Slang Termsto ingest an illicit drug orally;
    swallow.

v.t. 
  1. to let fall in drops or small portions:to drop lemon juice into tea.
  2. to let or cause to fall.
  3. to cause or allow to sink to a lower position.
  4. to cause to decrease in value, amount, quality, etc.;
    reduce.
  5. to utter or express casually or incidentally:to drop a hint.
  6. to write and send:Drop me a note.
  7. to bring to the ground by a blow or shot.
  8. to set down or unload, as from a ship, car, etc. (often fol. by off ):Drop me at the corner.
  9. Phoneticsto omit (a letter or syllable) in pronunciation or writing:He dropped his h's.
  10. to lower (the voice) in pitch or loudness.
  11. to cease to keep up or have to do with:I dropped the subject. Will you drop your old friends if you win the lottery?
  12. to cease to employ, admit as a member, or include, as on a list;
    dismiss:to drop an accountant from the payroll; to drop three members of the club who have not paid their dues.
  13. to withdraw or cease to pursue:The police dropped the charges against the suspect.
  14. Sport
    • to throw, shoot, hit, kick, or roll (a ball, puck, etc.) through or into a basket, hole, or other goal:He dropped the ball through the basket for two points.
    • to lose (a game or contest):They dropped two games in a row and were eliminated from the tournament.
  15. Sport[Football.]
    • to drop-kick (a ball).
    • to score with a drop kick.
  16. (of animals) to give birth to:The cat dropped a litter of six kittens.
  17. to parachute (persons, supplies, etc.):The Marines dropped 300 combat troops into the jungle battlefield.
  18. to lengthen by lowering or letting out:to drop the hem of a skirt.
  19. Aeronauticsto lower (the wheels) into position for landing an airplane.
  20. Slang Termsto take (esp. an illicit drug) by swallowing;
    ingest:to drop LSD.
  21. Nautical, Naval Termsto pass out of sight of;
    outdistance.
  22. Food[Cookery.]to poach (an egg).
  23. drop behind, to fall short of the required pace or progress:Her long illness caused her to drop behind the rest of the class.
  24. Idiomsdrop dead, (used as an expression of contempt, disgust, impatience, etc.):If that's the way you feel about it, drop dead!
  25. drop off: 
    • to fall asleep.
    • to decrease;
      decline:Sales have dropped off drastically.
  26. drop out: 
    • to withdraw from being a member or participant:to drop out of a club; to drop out of society and become a wanderer.
    • to stop attending school or college.
droplike′, adj. 
  • bef. 1000; (noun, nominal) Middle English drop(e) drop of liquid, Old English dropa; (verb, verbal) Middle English droppen, Old English droppian; akin to drip, droop

'drop off' also found in these entries (note: many are not synonyms or translations):
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