Etymology
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touch (v.)

late 13c., "make deliberate physical contact with," from Old French tochier "to touch, hit, knock; mention, deal with" (11c., Modern French toucher), from Vulgar Latin *toccare "to knock, strike" as a bell (source also of Spanish tocar, Italian toccare), perhaps of imitative origin. Related: Touched; touching.

From c. 1300 in the transitive sense "bring into physical contact," also "pertain to." Other senses attested from 14c. are "perceive by physical contact, examine by sense of touch," also "be or come into physical contact with; come to rest on; border on, be contiguous with;" also "use the sense of touch," and "mention, describe." From early 14c. as "affect or move mentally or emotionally," with notion of to "touch" the heart or mind. Also from early 14c. as "have sexual contact with." Meaning "to get or borrow money" first recorded 1760.

Touch-and-go (adj.) is recorded from 1812, apparently from the name of a tag-like game, first recorded 1650s (however, despite the coincidence, this in no way suggests an acronym origin for tag). Touch football is first attested 1933. Touch-me-not (1590s) translates Latin noli-me-tangere.

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touch (n.)
c. 1300, from Old French toche "touch, a touching; a blow, attack; a test" (Modern French touche), from tocher "to touch" (see touch (v.)). Meaning "slight attack" (of an illness, etc.) is recorded from 1660s. Sense of "communication" (to be in or out of touch) is from 1884. Sense of "skill or aptitude in some topic" is first recorded 1927, probably from music or the arts. Soft touch "person easily manipulated" is recorded from 1940.
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touch-up (n.)
"act of improvement requiring modest effort," 1872, from verbal phrase touch up "improve or finish (as a painting or drawing) with light strokes" (1715), from touch (v.) + up (adv.).
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touched (adj.)
"stirred emotionally," mid-14c., past-participle adjective from touch (v.).
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touching (adj.)
"affecting the emotions," c. 1600, present-participle adjective from touch (v.).
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touching (prep.)
"concerning, regarding," late 14c., from touch (v.), on model of French touchant.
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tetched (adj.)
1930, U.S. colloquial variant of touched in the sense of "slightly crazy" (see touch (v.)).
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touchwood (n.)
1570s, from touch (v.) + wood, probably from the notion of being set alight at the touch of a spark.
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