The idiom "with a grain of salt" means to view something with skepticism or not to take it too literally. It suggests that the information or statement may not be entirely accurate or should be taken lightly. The phrase implies a level of caution in accepting something at face value.
To take something that someone says with a grain of salt means that you should not necessarily believe everything he/she tells you.
I have never heard this phrase before, so I don't think it's an idiom. You can't have a herd of grain - ask the person what they actually said.
to make a bad thing worse
It means "with a grain of salt."
Don't take it too seriously.
Depends how big the grain of salt is.
And Take It with a Grain of Salt was created in 2002.
No, Salt is a mineral composed of Na and Cl ions. A grains is usually a single seed of a cereal. A grain of salt, may mean a single small piece of salt - and taken with a grain of salt is a figure of speech meaning to be skeptical.
A grain can be a tiny piece of rock, yes. A grain can also be a grain of salt, meaning one 'pellet' of salt.
The expression "I took it with a grain of salt" meant "I didn't believe it".
There are approximately 58,000 nanograms in a single grain of salt.
What she says with a grain of salt