with a grain of salt

early 13c., from Old North French *pinchier "to pinch, squeeze, nip; steal" (Old French pincier, Modern French pincer), of uncertain origin, possibly from Vulgar Latin *punctiare "to pierce," which might be a blend of Latin punctum "point" + *piccare "to pierce." Meaning "to steal" in English is from 1650s. Sense of "to be stingy" is recorded from early 14c. Related: Pinched; pinching.