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butterflies in one's stomach

butterflies in one's stomach idiom

Fluttering sensations caused by a feeling of nervous anticipation. For example, I always get butterflies in my stomach before making a speech. This term likens a nervous feeling to that resulting from swallowing live butterflies that fly about inside one. [c. 1900]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.