Definition of jack in
: to stop doing (something) He was building a new shed but jacked it in and watched the ball game. He jacked in his job and became a hippie.
Word by Word Definitions
: a game played with a set of small objects that are tossed, caught, and moved in various figures
: a small 6-pointed metal object used in the game of jacks
: a playing card carrying the figure of a soldier or servant and ranking usually below the queen
: to move or lift by or as if by a jack
: to take to task
: to hunt or fish for at night with a jacklight
Seen and Heard
What made you want to look up jack in? Please tell us where you read or heard it (including the quote, if possible).