To regard something with skepticism or doubt; to not fully believe or accept information as completely true.
This phrase dates back to ancient Rome, where Pliny the Elder mentioned taking an antidote 'with a grain of salt' to make it more effective. The metaphor evolved to suggest that adding salt (skepticism) makes unpalatable information more digestible and less harmful.
The phrase beautifully captures how our ancestors understood that salt was both a preservative and a flavor enhancer - just as healthy skepticism preserves our judgment and enhances our critical thinking. Interestingly, the Latin original 'cum grano salis' was likely already metaphorical when Pliny used it!
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