to stop doing something停止做
US call it even to agree with someone that a debt has been paid and that no one owes anything more同意债务已偿清,同意已互不相欠
I paid for last week's shopping and you paid for this week's, so let's call it quits.上周买东西我付的钱,这周是你付的,这样我们就两不相欠了。