WordReference Random House Learner's Dictionary of American English © 2020
sleep /slip/USA pronunciation   v.,  slept/slɛpt/USA pronunciation  sleep•ing, n. 
  1. Physiology[no object] to go into or be in the condition of rest that comes when the body suspends certain functions and is in a state of unconsciousness.
  2. to have enough beds, or a place to sleep, for (people):[+ object]This trailer sleeps three people.
  3. to allow one's alertness to become less active:[no object]The salespeople must have been sleeping when the shoplifter came in.
  4. [no object] to lie in death.
  5. to take rest in (a certain kind of sleep):[+ object]The baby slept the sleep of the innocent.
  6. sleep around, [no object] to have sexual relationships with many different partners:She accused her husband of sleeping around with other women.
  7. sleep away, [+ object + away] to spend or pass (time) in sleep:She slept the night away.
  8. sleep in, [no object]
    • (of a servant, maid, etc.) to sleep where one is employed.
    • to sleep beyond one's usual time of arising:Tomorrow there will be no school so you can sleep in.
  9. sleep off, to get rid of (a headache, etc.) by sleeping: [+ off + object]to sleep off a bad hangover.[+ object + off]to sleep it off.
  10. sleep on, [+ on + object] to postpone making a decision about (something) for at least a day:Thanks for your proposal; I think I'll sleep on it and call you tomorrow.
  11. sleep out, [no object]
    • (of a servant, maid, etc.) to sleep away from one's place of employment.
    • to sleep outdoors.
  12. sleep over, [no object] to sleep in another person's home:My daughters want to sleep over (at) their cousin's.
  13. sleep through, [+ through + object] to sleep in spite of (noise or the like):There was a loud party in the next room but somehow we slept through it.
  14. sleep together, [no object] to be sexual partners.
  15. sleep with, [+ with + object] to have sexual relations with:He said he had never slept with anyone but his wife.

  1. the state of a person, animal, or plant that sleeps:[uncountable]Sleep wouldn't come, and he lay awake most of the night.
  2. a period of sleeping:[countable;  usually singular]a good sleep.
  3. the substance in one's eyes after having slept:[uncountable]to rub the sleep from her eyes.
  1. get to sleep, to succeed in falling asleep:The night before we left for our new home we couldn't get to sleep.
  2. go to sleep: 
    • to fall asleep:Everytime the baby went to sleep, the gas pains woke her up again.
    • to get ready to sleep, as by going to one's bed:The kids didn't want to go to sleep; they were too excited.
    • to become numb:My foot's gone to sleep and I can't stand on it.
  3. put (someone or something) to sleep, to kill in a painless way:They had to put their dog to sleep.

sleep•less, adj. 
sleep•less•ness, n. [uncountable]
    sleep is both a noun and a verb, asleep and sleepy are adjectives:He fell into a deep sleep. He slept deeply. He was asleep and didn't wake up when the phone rang. He was sleepy and ready for bed.

WordReference Random House Unabridged Dictionary of American English © 2020
sleep  (slēp),USA pronunciation v.,  slept, sleep•ing, n. 
  1. Physiologyto take the rest afforded by a suspension of voluntary bodily functions and the natural suspension, complete or partial, of consciousness;
    cease being awake.
  2. Botanyto assume, esp. at night, a state similar to the sleep of animals, marked by closing of petals, leaves, etc.
  3. to be dormant, quiescent, or inactive, as faculties.
  4. to be careless or unalert;
    allow one's alertness, vigilance, or attentiveness to lie dormant:While England slept, Germany prepared for war.
  5. to lie in death:They are sleeping in their tombs.

  1. to take rest in (a specified kind of sleep):He slept the sleep of the innocent.
  2. to accommodate for sleeping;
    have sleeping accommodations for:This trailer sleeps three people.
  3. to spend or pass in sleep (usually fol. by away or out):to sleep the day away.
  4. to recover from the effects of (a headache, hangover, etc.) by sleeping (usually fol. by off or away).
  5. sleep around, [Informal.]to have sexual relations with many partners, esp. in a casual way;
    be sexually promiscuous.
  6. sleep in: 
    • (esp. of domestic help) to sleep where one is employed.
    • to sleep beyond one's usual time of arising.
  7. sleep on, to postpone making a decision about for at least a day:to sleep on a proposal till the end of the week.
  8. sleep out: 
    • (esp. of domestic help) to sleep away from one's place of employment.
    • [Chiefly Northern U.S.]to sleep away from one's home.
    • to sleep outdoors.
  9. sleep over, to spend one or more nights in a place other than one's own home:Two friends will sleep over this weekend.
  10. sleep together, to be sexual partners;
    have a sexual relationship.
  11. sleep with, to have sexual relations with.

  1. the state of a person, animal, or plant that sleeps.
  2. a period of sleeping:a brief sleep.
  3. dormancy or inactivity.
  4. the repose of death.
  5. sleeper (def. 10).
  6. put to sleep, to put (an animal) to death in a humane way:to put a sick old dog to sleep.
sleepful, adj. 
sleeplike′, adj. 
  • bef. 900; (noun, nominal) Middle English; Old English slēp (Anglian), slǣp, slāp; cognate with Dutch slaap, German Schlaf, Gothic slēps; (verb, verbal) Middle English slepen, Old English slēpan, slǣpan, slāpan, cognate with Old Saxon slāpan, Gothic slēpan
    • 1.See corresponding entry in Unabridged slumber, nap, drowse, doze.
    • 17.See corresponding entry in Unabridged rest, repose.
    • 18.See corresponding entry in Unabridged nap.

Collins Concise English Dictionary © HarperCollins Publishers::
sleep /sliːp/ n
  1. a periodic state of physiological rest during which consciousness is suspended and metabolic rate is decreased
  2. the nontechnical name for nyctitropism
  3. a period spent sleeping
  4. a state of quiescence or dormancy
  5. a poetic or euphemistic word for death
vb (sleeps, sleeping, slept)
  1. (intransitive) to be in or as in the state of sleep
  2. (intransitive) (of plants) to show nyctitropism
  3. (intransitive) to be inactive or quiescent
  4. (transitive) to have sleeping accommodation for (a certain number): the boat could sleep six
  5. (transitive) followed by away: to pass (time) sleeping
  6. (intransitive) poetic or euphemistic to be dead
  7. sleep on itto give (something) extended consideration, esp overnight

See also sleep around, sleep inEtymology: Old English slǣpan; related to Old Frisian slēpa, Old Saxon slāpan, Old High German slāfan, German schlaff limp
'sleep on it' also found in these entries (note: many are not synonyms or translations):
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