I cannot find a firm origin for this saying. Evidently people once believed that the nervous sensation might be caused by something you had eaten.
metephor
"I'm so nervous about tonight i have 'Butterflies in my stomach'."
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.
He will if he likes you back
I was about to ask her to marry me, and I felt butterflies in my stomach.
It does have to do with the feeling you get in your stomach when you get nervous, excited or you when you are in love. it really has nothing to do with butterflies.
yes in a way because you don't actually have butterflies in your stomach
no
Origin: In the 1500's, a lot of people owned cows and sheep. These are animals that chew their cuds (food that is spit up from the stomach to the mouth and chewed again). It is a long process.
To be exposed
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Origin "up a storm"