/kwɪts; kwɪts/
adj (idm 习语) be quits (with sb) be on even terms after a debt of money, etc has been repaid （因已偿清财物等）抵销的, 对等的
*Are we quits or do you still owe me a pound? 咱们是已经两相抵销了呢, 还是你仍欠我一镑呢? call it quits => call2. double or quits => double4.

adj informal
[Date: 1600-1700; Origin: Probably from quit 'free of'; QUITE]
be quits
BrE if two people are quits, neither one owes anything to the other
= straight
　I'll give you £10, and then we're quits.
call it quits
a) to agree that a debt or argument is settled
　Just give me $20 and we'll call it quits.
b) to stop doing something
　After twenty-five years as a teacher, he's decided to call it quits.