have butterflies in your stomach

US /hæv ˈbʌt.ər.flaɪz ɪn jʊər ˈstʌm.ək/
UK /hæv ˈbʌt.ər.flaɪz ɪn jʊər ˈstʌm.ək/
"have butterflies in your stomach" picture
1.

to feel very nervous or excited about something

:
I always have butterflies in my stomach before a big presentation.
She had butterflies in her stomach on her wedding day.