My understanding of that idiom (and how I see it most commonly used) is that the skepticism is proportional to the salt. Slightly suspect things only get a bit

My understanding of that idiom (and how I see it most commonly used) is that the skepticism is proportional to the salt. Slightly suspect things only get a bit of salt and skepticism, hugely unproven things get a lot of salt and skepticism. Given that, an unproven but large claim would need a lot of salt and skepticism Based on the supposed origin of the idiom, I think salt and skepticism being proportional is a bit closer to the original meaning, than them being inversely proportional, though neither is especially close. https://en.wikipedia.org/wiki/Grain_of_salt https://en.wikipedia.org/wiki/Grain_of_salt