17. pay back报复 (= pay off, pay out, serve out) , 偿还, 偿付; pay off 还清, 偿清, 报复,偿还, 结清工资解雇（某人）,成功; pay out 花费,支出, 放松（绳子）,放出; pay up（不情愿地）付清；还清（债务）

I'll certainly _____ you ______ for what you did to me!

Our plan certainly _________; it was a great idea.

I __________  a lot of money for that car.