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

1.
割り引いて聞く, 鵜呑みにしない
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.
彼の言うことはすべて割り引いて聞くべきだ。彼は誇張する傾向があるからね。
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I'd take that rumor with a grain of salt; it sounds too good to be true.
その噂は割り引いて聞くべきだ。話がうますぎる。