1952, short for jockstrap "supporter of the male genital organs," which also meant, in slang, "athletic male." Jock with the meaning "an athletic man" is from 1963, American English slang. A jockette (1948) originally was a female disk jockey, then a female jockey (1969), then an athletic female (1979).
late 14c., "shaped like a club, thick at the end," from club (n.). Specifically of defects of the foot by c. 1500; meaning "formed into a club" is from 1620s.
name of a club founded by Whig politicians in London (Addison and Steele were members), 1703; so called from Christopher ("Kit") Catling, or a name similar to it, a tavernkeeper or pastry cook in London, in whose property the club first met. Hence "a size of portrait less than half length in which a hand may be shown" (1754), supposedly is because the dining room in which portraits of club members hung was too low for half-length portraits.
1819, from French tabagie (17c.), from tabac "tobacco" (see tobacco) + -age. A group of smokers who meet in club fashion; a "tobacco-parliament." In German, a Rauchkneipe.