say it: BUHT-ur-flahy
butterfly is a verb and noun meaning "flutter like a butterfly". It carries 5 recorded senses.
flutter like a 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
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for butterfly come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.