quit on

quit on someone

 
1. [for something] to quit while someone is using it. This stupid car quit on me. I hope this thing doesn't quit on me.
2. [for one] to leave one's job, usually suddenly or unannounced. Wally, the park supervisor, quit on us at the last minute. My assistant quit on me.
See also: on, quit

quit on

v.
1. To stop helping or working with someone, especially when the support or assistance is needed: My friends quit on me when I really needed them.
2. To stop functioning properly for someone; give out on someone: The car's battery quit on us when we were a mile from the city. My knee quit on me in the last mile of the marathon.
See also: on, quit