To settle a score later; to get even after an event has passed; to wait for an opportune moment to deal with someone or exact retribution.
他现在虽然忍气吞声，但我敢肯定他会在秋后算账的，所以你还是小心点。
Although he's swallowing his pride now, I'm sure he'll settle accounts later, so you'd better be careful.
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