take something with a grain of salt
US /teɪk ˈsʌmθɪŋ wɪð ə ɡreɪn əv sɔlt/
UK /teɪk ˈsʌmθɪŋ wɪð ə ɡreɪn əv sɔlt/

1.
prendere con le pinze, non credere completamente
to not completely believe something that you are told because you think it is unlikely to be true
:
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You should take everything he says with a grain of salt; he tends to exaggerate.
Dovresti prendere tutto quello che dice con le pinze; tende a esagerare.
•
I'd take that rumor with a grain of salt; it sounds too good to be true.
Prenderei quella voce con le pinze; sembra troppo bella per essere vera.