1PHRASAL VERB 偿还 If you pay back some money that you have borrowed or taken from someone, you give them an equal sum of money at a later time. 偿还 [Also VERB n PREPOSITION]
He burst into tears, begging her to forgive him and swearing to pay back everything he had stolen. [VERBPREP. noun]
他突然大哭起来,求她原谅,并发誓偿还他偷的所有东西。
I'll pay you back that two quid tomorrow. [VERB noun PREP. noun]
2PHRASAL VERB 报复;惩罚 If you pay someone back for doing something unpleasant to you, you take your revenge on them or make them suffer for what they did. 报复;惩罚 [Also VERB n PREPOSITION]
Some day I'll pay you back for this! [V n P + for]