「轻微的惩罚」原来可以这样说！

a slap on the wrist 

轻微的惩罚；轻微到不行的处罚

I thought I'd get a slap on the wrist for speeding, but I got fined $500.

本以为我的超速只会受到小小的惩罚，结果却被罚了500块。

Just give Peter a slap on the wrist as a warning. Because it's the very first time he's ever been late. 

给Peter 一个小小的警告就好了，毕竟只是他第一次迟到。