"You had better," or "You'd better," means that you should do whatever it is. This phrase is used to coerce or urge someone. "You'd better do your homework," is one example. The unspoken part of this phrase is that if you don't do whatever it is, you will be punished, or will get an unwelcome consequence.
Remain confident, do not worry, things will go better tomorrow.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
RFP is not an idiom. It's an abbreviation.
If used as an idiom, it usually means that you are confused about something. The image is of you scratching your head to try to think better.
"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
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
Simply its mean a bully.
It's not an idiom, and it's "A picture paints 1,000 words." It means that showing is better than telling, that actions speak louder than words, that the way you act shows your true intentions better than the things you say you'll do.
The idiom your blood is boiling usually means that you are mad/furious.