late 13c., from Old French touchier "to touch, hit, knock" (11c.), from Vulgar Latin *toccare "to knock, strike" as a bell (cf. Spanish tocar, Italian toccare), perhaps of imitative origin. Meaning "to get or borrow money" first recorded 1760. Related: Touched; touching.
Touch and go (adj.) is recorded from 1812, apparently from the name of a tag-like game, first recorded 1650s. Touch football is first attested 1933. Touch-me-not (1590s) translates Latin noli-me-tangere.
c.1300, from Old French touche "a touching," from touchier (see touch (v.)). Meaning "slight attack" (of an illness, etc.) is recorded from 1660s. Sense of "skill or aptitude in some topic" is first recorded 1927. Soft touch "person easily manipulated" is recorded from 1940.
The physiological sense by which external objects or forces are perceived through contact with the body.