It's short for "get a bite to eat" - it means to go have something to eat.
It means to get smething to eat quickly. It is usually used when one is in a rush
This is not an idiom. The idiom is "her BARK is worse than her bite" which is a dog reference meaning that she and the dog make a lot of noise but aren't really dangerous. This sentence seems to mean that she has an injured shoulder which is worse than a bite that she also has.
grab a bite
A bite of the cherry is an idiom for a chance or attempt at something.
"To be" is not an idiom - it's a verb.
"All bark and no bite," "Across the board," "Day late and a dollar short" are all examples of idioms. An idiom is a colloquial metaphor, meaning a term requiring some previous knowledge, to be used only in a certain culture.
Let's meet at a restaurant and get a bite to eat.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.
The meaning of the idiom in the pink of health means being in good health.
There is no way to say that. It is an English idiom.
"Bite me" is a rude expression in English. To convey a similar meaning, one would need to find a similarly rude Spanish idiom, rather than a verbatim translation.