Jack may refer to:


Jack is a male given name and sometimes as a surname. In English it is traditionally used as the diminutive form of the name John, though it is also often given as a proper name in its own right.

The name Jack is unique in the English language for the frequency of its use as a verb and a noun for many common objects and actions; and also its use in many compound words and phrases: jack-of-all-trades, jackknife, jackpot, jack tar, hijack, union jack, jack straw (scarecrow), apple jack, lumberjack, jackhammer, jackdaw, jack o'lantern, jack-off, jack-in-the-box, jack of clubs (playing cards), etc. The varied uses are traceable to the common use of the word as a by-name of a man.

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