Collins Concise English Dictionary © HarperCollins Publishers::
touch up vb (tr, adverb)
  1. to put extra or finishing touches to
  2. to enhance, renovate, or falsify by putting extra touches to: to touch up a photograph
  3. to stimulate or rouse as by a tap or light blow
  4. Brit slang to touch or caress (someone), esp to arouse sexual feelings
n touch-up
  1. a renovation or retouching, as of a painting
WordReference Random House Learner's Dictionary of American English © 2020
touch /tʌtʃ/USA pronunciation   v. 
  1. Physiologyto put the hand, finger, etc., on or into contact with (something) so as to feel it: [+ object]He touched the stove cautiously.[no object]You may look at it but don't touch.
  2. to bring (the hand, etc., or something held) into contact with something:[+ object]touched a match to the papers.
  3. to pat or tap as with the hand or an instrument:[+ object]She touched me gently on the shoulder.
  4. Geographyto come into contact with;
    be next to: [+ object]My shoulder was touching hers.[no object]Our shoulders were touching on the crowded elevator.
  5. to be as good as (something else);
    compare with (something) :[+ object;  usually with a negative word or phrase]He wrote with a style that couldn't touch mine.
  6. to treat or affect in some way by contact:[+ object]All you have to do is touch that computer and everything goes haywire with it.
  7. [+ object] to move (someone) to feel sympathy:Your kindness touched me deeply.See touching, touched below.
  8. to have to do with in any way:[+ object;  usually with a negative word or phrase]She can't touch her trust money until she's 21.
  9. to eat or drink;
    consume;
    taste:[+ object;  usually with a negative word or phrase]He won't touch another drink.
  10. to put one's hands on (a person), as to do something violent or sexual:[+ object]Don't touch that kid again!
  11. to be a matter of importance to;
    affect:[+ object]Such poverty never touches her life.
  12. Slang Termsto ask (someone) for money, or succeed in getting money from:[+ object]He touched me for a loan.
  13. touch down, [no object] (of an aircraft or spacecraft) to land.
  14. touch off: 
    • to cause to ignite or explode: [+ off + object]The flame touched off the explosion.[+ object + off]What touched it off?
    • to start, esp. suddenly: [+ off + object]The incident touched off a firestorm of debate.[+ object + off]That's what touched the debate off.
  15. touch on or  upon, [+ on + object] to mention (a subject) casually:Her speech touched on the issue of employee benefits.
  16. touch up, to make minor changes in the appearance of: [+ up + object]The artist touched up the painting.[+ object + up]She touched it up.

n. 
  1. the act of touching;
    state or fact of being touched:[countable]a light touch on his shoulder.
  2. Physiology that sense by which anything material is felt by physical contact:[uncountable]a well-developed sense of touch.
  3. the quality of something touched that imparts a sensation;
    feel:[uncountable]The touch of her hand was enough to thrill him.
  4. a coming into or being in contact or good relations with another:[uncountable]Over the years we lost touch. Let's keep in touch.
  5. ability or skill;
    a knack for doing something:[uncountable]He seems to have lost his touch in dealing with people.
  6. a slight attack, as of illness:[countable]He's had a touch of the flu.
  7. a slight added effort in completing any piece of work:[countable]put some finishing touches on the painting.
  8. [countable] skill or manner of execution in artistic work, in playing a musical instrument, etc.
  9. [countable] the manner or speed of action of the keys of an instrument, as of a piano.
  10. a slight amount of some quality, emotion, etc.:[countable]There was a touch of sadness in her voice.
  11. Slang Terms[countable]
    • the act of approaching someone for money (as a gift ):to put the touch on her for fifty bucks.
    • a person thought of in terms of getting money from:He's an easy touch.
touch•a•ble, adj. 

WordReference Random House Unabridged Dictionary of American English © 2020
touch-up  (tuchup′),USA pronunciation n. 
  1. an act or instance of touching up:Her makeup needed a touch-up.
  • noun, nominal use of verb, verbal phrase touch up 1880–85

WordReference Random House Unabridged Dictionary of American English © 2020
touch (tuch),USA pronunciation  v.t. 
  1. to put the hand, finger, etc., on or into contact with (something) to feel it:He touched the iron cautiously.
  2. to come into contact with and perceive (something), as the hand or the like does.
  3. to bring (the hand, finger, etc., or something held) into contact with something:She touched a match to the papers.
  4. to give a slight tap or pat to with the hand, finger, etc.;
    strike or hit gently or lightly.
  5. to come into or be in contact with.
  6. [Geom.](of a line or surface) to be tangent to.
  7. to be adjacent to or border on.
  8. to come up to;
    reach;
    attain.
  9. to attain equality with;
    compare with (usually used with a negative):a style that cannot touch that of Shakespeare.
  10. to mark by strokes of the brush, pencil, or the like.
  11. to mark or relieve slightly, as with color:a gray dress touched with blue.
  12. to stop at (a place), as a ship:The ship touched shore several times during the cruise.
  13. to treat or affect in some way by contact.
  14. to affect as if by contact;
    tinge;
    imbue.
  15. to affect with some feeling or emotion, esp. tenderness, pity, gratitude, etc.:Their sufferings touched his heart.
  16. to handle, use, or have to do with in any way (usually used with a negative):She can't touch the money until she's 21.
  17. to eat or drink;
    consume;
    taste (usually used with a negative):He won't touch another drink.
  18. to lay hands on, often in a violent manner:Don't you touch this child!
  19. to deal with or treat in speech or writing.
  20. to refer or allude to.
  21. to pertain or relate to:a critic in all matters touching the kitchen.
  22. to be a matter of importance to;
    make a difference to;
    affect:This grave decision touches all of us.
  23. [Metall.]to stamp (metal) as being of standard purity.
  24. [Slang.]to apply to for money, or succeed in getting money from:He touched me for five dollars.
  25. [Slang.]to steal from.
  26. [Archaic.]
    • to strike the strings, keys, etc., of (a musical instrument) so as to cause it to sound.
    • to play or perform (an air, notes, etc.) on a musical instrument.

v.i. 
  1. to place the hand, finger, etc., on or in contact with something.
  2. to come into or be in contact.
  3. to make a stop or a short call at a place, as a ship or those on board (usually fol. by at).
  4. touch base with. See base1 (def. 29).
  5. touch down, (of an airplane) to come into contact with the ground;
    land.
  6. touch off: 
    • to represent or characterize precisely.
    • to cause to ignite or explode.
    • to give rise to;
      initiate:This incident will touch off another crisis.
  7. touch on or upon: 
    • to mention a subject briefly or casually;
      treat of in passing:In his lecture he touched on the major aspects of the controversy.
    • to come close to;
      approach.
    • to relate or pertain to.
  8. touch up: 
    • to make minor changes or improvements in the appearance of.
    • to modify or improve (a painting, photograph, etc.) by adding small strokes or making slight changes.
    • to rouse by or as if by striking:This should touch up your memory.

n. 
  1. the act or state of touching;
    state or fact of being touched.
  2. that sense by which anything material is perceived by means of physical contact.
  3. the quality of something touched that imparts a sensation:an object with a slimy touch.
  4. a coming into or being in contact.
  5. mental or moral perception, sensitivity, or understanding:He has a marvelous touch in dealing with people.
  6. ability, skill, or dexterity;
    knack:to lose one's touch.
  7. [Fencing.]the contact of the point of a foil or épée or the point or edge of the blade of a saber with a specified portion of the opponent's body, counting one point for the scorer.
  8. close communication, agreement, sympathy, or the like:to be out of touch with reality; Let's keep in touch.
  9. a slight stroke or blow.
  10. a slight attack, as of illness or disease:a touch of rheumatism.
  11. a slight added action or effort in doing or completing any piece of work:to provide the finishing touches.
  12. manner of execution in artistic work.
  13. the act or manner of touching or fingering a keyboard instrument.
  14. the mode of action of the keys of an instrument, as of a piano or typewriter.
  15. [Change Ringing.]a partial series of changes on a peal of bells.
  16. a stroke or dash, as with a brush, pencil, or pen.
  17. a detail in any artistic work.
  18. a slight amount of some quality, attribute, etc.:a touch of sarcasm in his voice.
  19. a slight quantity or degree:a touch of salt.
  20. a distinguishing characteristic or trait:the touch of the master.
  21. quality or kind in general.
  22. an act of testing something.
  23. something that serves as a test;
    touchstone.
  24. [Slang.]
    • the act of approaching someone for money as a gift or a loan.
    • the obtaining of money in this manner.
    • the money obtained.
    • a person considered from the standpoint of the relative ease with which he or she will lend money:I can always hit him for ten—he's an easy touch.
  25. [Slang.]theft.
  26. [Metall.]
    • an official mark put upon precious metal after testing to indicate its purity.
    • a die, stamp, or the like for impressing such a mark.
    • an identifying mark impressed on pewter by its maker.
  27. [Soccer.]the area outside the touchlines.
  28. [Rugby.]either of the touchlines or the area outside of the touchlines.
  29. put the touch on, [Informal.]to try to borrow money from:Willie put the touch on me for another ten last night.
touch a•ble, adj. 
touch a•ble•ness, touch′a•bili•ty, n. 
touch er, n. 
touch less, adj. 
  • Old French, derivative of tochier, partly derivative of the verb, verbal
  • Vulgar Latin *toccāre to knock, strike, touch, of expressive origin, originally; (noun, nominal) partly continuing Middle English touche state or act of touching
  • Old French tochier
  • (verb, verbal) Middle English to(u)chen 1250–1300
    • 1.See corresponding entry in Unabridged handle, feel.
    • 13.See corresponding entry in Unabridged impress.
    • 15.See corresponding entry in Unabridged move, strike, stir, melt, soften.
    • 21.See corresponding entry in Unabridged concern, regard, affect.
    • 43.See corresponding entry in Unabridged pat, tap.
    • 53.See corresponding entry in Unabridged hint, trace, suggestion.

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