but·ter·fly 
(bŭtər-flī′)
(bŭtər-flī′)n.
1. Any of numerous insects of the order Lepidoptera, having four broad, usually colorful wings, and generally distinguished from the moths by having a slender body and knobbed antennae and being active during the day.
2. A person interested principally in frivolous pleasure: a social butterfly.
3. Sports
a. A swimming stroke in which a swimmer lying face down draws both arms upward out of the water, thrusts them forward, and draws them back under the water in an hourglass design while performing a dolphin kick.
b. A race or a leg of a race in which this stroke is swum.
4. butterflies A feeling of unease or mild nausea caused especially by fearful anticipation.
tr.v. but·ter·flied, but·ter·fly·ing, but·ter·flies
To cut and spread open and flat, as shrimp.
[Middle English butterflye, from Old English butorflēoge : butor, butere, butter; see BUTTER + flēoge, fly; see FLY2.]
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