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.