1. pinch of salt - Noun
2. pinch of salt - Phrase
A small amount of salt.
(figuratively) Caution, doubt, consideration.
Take anything he tells you with a pinch of salt: he's an inveterate liar and mixes truth with his fiction liberally.
Sketching from nature is very like trying to put a pinch of salt on her tail. And yet many manage to do it very nicely. Samuel Butler (novelist)