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Phrase(s): *butterflies in one’s stomach
a nervous feeling in one’s stomach. (*Typically: get ~; have ~; give someone ~.) • Whenever I have to speak in public, I get butterf lies in my stomach. • She always has butterf lies in her stomach before a test. • It was not frightening enough to give me butterf lies in my stomach, but it made me a little apprehensive.
McGrawhill's American Idioms And Phrasal Verbs