Webster's English Dictionaryjack
1. jack \'jak\ n [ME jacke, fr. Jacke, nickname for Johan John] [by shortening] [by shortening] [by shortening] often attrib cap 1a: MAN; esp : one who is representative of the common people often cap 1b: SAILOR 1c1: LABORER, SERVANT 1c2: LUMBERJACK 2: any of various mechanical devices : as 2a: a device for turning a spit 2b: any of various portable mechanisms for exerting pressure or lifting a h eavy body a short distance 3: something that supports or holds in position : as 3a: a bar of iron at a topgallant masthead to support a royal mast and spre ad the royal shrouds 3b: a wooden brace fastened behind a scenic unit in a stage set to prop it up 4a: any of several fishes; esp : a young male salmon 4b: a male donkey 4c: any of several birds (as a jackdaw) 5a: something smaller than the usual of its kind - used in combination (jackshaft} 5b: a small white target ball in lawn bowling 5c: a small national flag flown by a ship pl but sing in constr 5d1: a game played with a set of small objects that are tossed, caught, and moved in various figures 5d2: a small 6-pointed metal object used in the game of jacks 6a: a playing card carrying the figure of a soldier or servant and ranking usu. below the queen 6b: JACKPOT slang 7: MONEY 8: a female fitting in an electric circuit used with a plug to make a conne ction with another circuit 9a: APPLEJACK 9b: BRANDY 10: JACKKNIFE 2. jack vi : to hunt or fish at night with a jacklight 1: to hunt or fish for at night with a jacklight 2a: to move or lift by or as if by a jack 2b1: INCREASE 2b2: to raise the level or quality of 2c: to take to task - jack.er n