to bide time for revenge; lit. settling accounts after the autumn harvest (idiom); to wait until the time is ripe to settle accounts
[square accounts after the autumn harvest——wait until after a political movement is over to settle accounts with the leadership or the masses] 原义是指秋收以后结清欠帐,现在常用来比喻等待时机进行报复,有贬义 我们一不抓辫子,二不打棍 子,又不搞什么秋后算帐之类的玩意。