To be tightfisted means that you hold on to your money. You're cheap.
When Mark called Joe tightfisted, Joe knew that Mark too, believed that he was cheap with his spending.
Crotchety and miserable Scrooge was rich but tightfisted. He eventually learned the connection between well being and generosity.
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
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.
"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.