Don't knock it意思其实是:不要太挑剔。also you can say: Don't be so picky!
例句 1:
Don't knock it! You won't be able to find another job that pays so well.
译文 1:
别挑剔了!你未必可以找到另一个待遇这么好的工作!
例句 2:
On this project I've tried my best, so please don't knock it.
译文 2:
在这个项目上我已经尽力了,所以请不要太挑剔了!
美语中关于“knock"的短语搭配有很多。将来会一一向学员们介绍。
Thanks
Johnny