c.1200, "fighting equipment," probably from Old Norse gervi "apparel," related to gerr "ready," and gerva "make ready," from Proto-Germanic *garwin- (cf. Old English gearwe "clothing, equipment, ornament;" Old High German garawi "clothing, dress," garawen "to make ready;" German gerben "to tan"). Meaning "toothed wheel in machinery" first attested 1520s. Slang for "male sex organs" from 1670s. British adjective slang sense of "stylish, excellent" first recorded 1951, from earlier that's the gear, expression of approval, 1925.
c.1200, "to equip oneself for fighting; dress," probably from gear (n.). Related: Geared; gearing.
In the most active, rapid, impressive phase; at full tempo: The advertising campaign is in high gear (1940s+)
Related TermsExcellent; wonderful; superb: The opposite of ''gear'' is ''grotty''
Related Termsin high gear, shift into high gear
[1950s+ British; fr the WWI British Army phrase that's the gear, ''that's right'']