butterfly stroke
Swimming term; the stroke where both arms move simultaneously over the water.
He swam 100 meters using the butterfly stroke.
Refers to a very skimpy underwear or swimwear style; often used in fashion or adult contexts.
She was wearing a thong swimsuit at the beach.
She is good at swimming the butterfly stroke.
She was wearing a G-string at the beach.
freshwater butterflyfish; African butterflyfish