anybody's guess
To "call it even" means to agree that there is no winner in a contest, or no debtor in an exchange.
This is not an idiom. Some people call their loved one by a pet name like "honey" or "darling" or "sweetie."
Don't call me, I'll call you
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
It is not an idiom, it means your nose is itching.
When someone challenges a false statement you've made or threat you didn't intend to follow through with.
a zero-sum game
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book
"Sieve" is not an idiom. See the related link.
if you mean 'is anyones skin chewy?' than i suppose so.