Jack - definition of jack by The Free Dictionary
Define jack. jack synonyms, jack pronunciation, jack translation, English dictionary definition of jack. n. 1. often Jack Informal A man; a fellow. 2. a. One who does odd or heavy jobs; a laborer. b. One who works in a specified manual trade. ... Slang A small or worthless amount: You don't know jack about that. v. jacked, jack·ing, jacks ...
DA: 22 PA: 31 MOZ Rank: 19