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general::
Phrase(s): take something with a pinch of salt [and] take something with a grain of salt
Fig. to listen to a story or an explanation with considerable doubt. • You must take anything she says with a grain of salt. She doesn’t always tell the truth. • They took my explanation with a pinch of salt. I was sure they didn’t believe me.
McGrawhill's American Idioms And Phrasal Verbs