"Sieve" is not an idiom. See the related link.
The phrase "carrying water in a sieve" is an idiom that refers to attempting a futile or impossible task. It suggests that the effort being made is pointless because the outcome will not be successful, similar to trying to carry water in a sieve, which cannot hold water.
It refers to a pointless action. Another similar British idiom is " carrying coals to Newcastle". It means: You are doing something that will have no positive affect. you are wasting your time! Obviousely you cannot really carry water in a sieve, so when someone says that, they are basically saying that you are not acheiving anything.
what is bigger a 3 sieve or 4 sieve green bean
There's not an idiom, but some slang terms include hog, chopper or bike.
Can you figure out the meaning by defining the terms? Yes, so it's a phrase instead of an idiom.
Please ask one question at a time. Each of these terms has already been defined on the site.
RFP is not an idiom. It's an abbreviation.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
Can you figure out what it means by defining the terms literally? Then no, it's not an idiom. The frog is creeping slowly past you.
idiom means expression like a page in a book
It's not an idiom. It means the tip of your nostril.