grain of salt

noun phrase
variants: or less commonly pinch of salt

Definition of grain of salt

: a skeptical attitude used in the phrase take (something) with a grain/pinch of salt I take the guidebooks with a grain of salt, preferring to follow my instincts.— Daisann McLaneThe malleability of memory … is the first reason why autobiographies should be taken with a grain of salt.— Judith Rich Harris

First Known Use of grain of salt

1647, in the meaning defined above

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The first known use of grain of salt was in 1647

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