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.
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.