Happy Friday everyone.
Today's idiom is " have butterflies ".
This means to be very nervous before doing something (i.e. giving a presentation).
Example 1
I always have butterflies before a big game.
Example 2
A. I've had butterflies in my stomach all week.
B. Why?
A. I'm meeting someone tomorrow night and I can't stop thinking about her.
https://idioms.thefreedictionary.com/have+butterflies