Definition of “quit” - Learner’s Dictionary

quit

verb us uk /kwɪt/ present participle quitting, past tense and past participle quit
NOT WORK [ I, T ]

B1 to leave your job or school permanently:

She recently quit / her job to spend more time with her family.
NOT DO [ T ]

B1 to stop doing something:

I quit smoking and put on weight.
COMPUTER [ I, T ]

to end a program on a computer

(Definition of “quit” from the Cambridge Learner's Dictionary © Cambridge University Press)