quit

For the verb: "to quit"

Simple Past:	quit
Past Participle:	quit

Concise Oxford English Dictionary © 2008 Oxford University Press:
quit/kwɪt/

▶verb (quits, quitting; past and past part. quitted or quit)

• 1 leave, especially permanently.

• 2 informal resign from (a job).

• 3 informal, chiefly N. Amer. stop or discontinue.

• 4 (quit oneself) archaic behave in a specified way.

▶adjective (quit of) rid of.

– phrases
quit hold of archaic let go of.

– origin ME: from OFr. quiter (v.), quite (adj.), from L. quietus, past part. of quiescere ‘be still’, from quies ‘quiet’.