pay back

名词 pay back:

1. financial return or reward (especially returns equal to the initial investment)
   同义词：payback
2. the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life
   同义词：vengeance, retribution, payback

动词 pay back:

1. act or give recompense in recognition of someone's behavior or actions
   同义词：reward, repay
2. take vengeance on or get even
   同义词：pay off, get, fix

1. He will pay back the money in monthly instalment.
   他将按月分期付款的方式偿还。
2. He will pay back the money in monthly installment.
   他将用每月分期付款方式将钱付还。
3. I lent him some money last week but he forgot to pay back.
   上周我借了一些钱给他，但他忘记归还。
4. Pay back the5,000 Yuan I loan you by today.
   我借给你的5,000元，今天还我吧。