set someone back (something)
phrasal verb with set verb uk/set/ us/set/ setting | set
informal
花去(某人)一大笔钱
to cost someone a large amount of money
Buying that suit must have set you back. 买那套西服一定花了你一大笔钱。
It's a handy gadget and will only set you back about $15. 这件有用的工具只需花你15美元。