a person saying that their 'stomach is in knots' means that a person is nervous about something. this comes from the physical feeling of nausea some people may feel associated with anxiety or apprehension.
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.
knotty; rough with knots.
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.
Yes
metephor
who said, My fortune for a cast iron stomach."
"I'm so nervous about tonight i have 'Butterflies in my stomach'."
You feel it in your stomach before you do anywhere else. When you lean over to kiss and you can feel knots in your stomach, it is love!
My nervousness when I go to the dentist always puts my stomach in knots.
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.
It's an idiom meaning that you feel nervous, because when you're nervous it feels like something in your stomach is fluttering or twisting.
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.