This is not an idiom - it means exactly what it says. You should stay fit and healthy.
Idiom is correct.
it means he or she was blushing due to occurring something on the spot and we can also take meaning from it like he is healthy and happy with the situation .
what is a idiom about a cat
"To be" is not an idiom - it's a verb.
The idiom "apple shiner" means the teacher's pet.
An idiom misuse is to use and idiom in a wrong way that doesn't make sense.
The idiom for 'larger than life' is "a force of nature."
Fat in this sense is a positive meaning - you need some fat in your diet in order to stay healthy. This means that someone is living off what they can grow and catch and find in the wild - the healthy part of the land.
It is a idiom.
Idiom Homograph Homophone Idiom Simile Homophone Homophone Idiom Homophone Idiom Simile Homograph Simile Homophone Simile
"He lost his shirt" IS an idiom.