It's left over from World War I - they fought in long trenches dug to protect the soldiers from enemy gunfire. If you're "in the trenches," you're figuratively in the middle of the battle, fighting man to man.
It is not an idiom, it means your nose is itching.
idiom means expression like a page in a book
Simply its mean a bully.
I think it means that that person agrees with that others persons idiom and that it fit that question that the teacher or whoever asked that question.
The correct idiom is "a frog in my throat," meaning that your voice is hoarse and croaking.
they fought in the trenches ww1 was known as a war in the trenches
It is not an idiom, it means your nose is itching.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book
The idiom a slap on the wrist refers to a trivial punishment.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Simply its mean a bully.
The idiom your blood is boiling usually means that you are mad/furious.
Nothing. You have left out part of the idiom. Perhaps you mean "your hands are tied," which means that you have no power to do anything in a given situation.