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butterfly (A2)

noun

Pronunciation: /ˈbʌtərflaɪ/

A flying insect with two pairs of large wings that are covered with tiny scales, often brightly colored.

butterfly effect (idiom): A small change in initial conditions can lead to large differences in a later state. — "The butterfly effect explains how a tiny decision can have massive consequences."
social butterfly (idiom): A person who is very sociable and likes to attend parties and social events. — "She's a real social butterfly, always invited to the best events."