Yes
Any idiom can be correct. The trick is to learn which one means what!
An idiom is the same in any language. It's a phrase that can't be taken literally. If you are asking for the Hebrew word for "idiom" it's neev (× ×™×‘).
Does it make any sense as read? Yes, so it is a metaphor instead of an idiom.
Any phrase that means exactly what it seems to mean is a NON-example. "The table was made of wood" is not an idiom.
It's not an idiom. It means exactly what it says. "By all means" or "by any method necessary."
An idiom is a phrase that doesn't make any sense unless you know the idiomatic definition. This phrase means exactly what it looks like, so it's not an idiom.
An idiom is a phrase that doesn't make any sense unless you know the definition. This phrase makes perfect sense, so it is not an idiom. The room became quiet.
Any phrase that means exactly what it seems to mean is a NON-example. "The table was made of wood" is not an idiom.
"Penniless" is not an idiom. It means that you don't have a penny to spend. It's used as an exaggeration to mean that you don't have any money.
The idiom of going to the dogs means that any person or thing has come to a bad end, been ruined, or looks terrible.
Idiom is correct.
Idioms are phrases that cannot be defined literally - bush is a word, not an idiom. I'm not aware of any special significance of the word.