take sth with a pinch of salt

UK (US take sth with a grain of salt)

to not completely believe something that you are told, because you think it is unlikely to be true

对…半信半疑，对…有所怀疑

关于这个短语的起源有一说从老普林尼的《自然历史》得知，当时发现一种毒药的解药配方其中一种成分是一粒盐。就有了吃点盐就能解毒的说法，因此，当谈及毒药的威胁时，人们就开始半信半疑。

You have to take everything she says with a pinch of salt, because she tends to exaggerate.

你不能完全相信她的话，她总是喜欢夸大其词。