/ dʒæg; NAmE / noun
( informal , especially NAmE ) a short period of doing sth or of behaving in a particular way, especially in a way that you cannot control :
a crying jag
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WORD ORIGIN
late 16th cent. (originally meaning a bundle): of unknown origin. In the late 18th cent. the sense was portion, quantity , later as much alcohol as one can hold , hence a binge . The current sense dates from the early 20th cent.