Definition of butterfly:
diurnal insect typically having a slender body with knobbed antennae and broad colorful wings
a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
flutter like a butterfly
cut and spread open, as in preparation for cooking; "butterflied shrimp"
talk or behave amorously, without serious intentions; "The guys always try to chat up the new secretaries"; "My husband never flirts with other women"