dolphin kick

English Thesaurus

1. a swimming kick; an up and down kick of the feet together (noun.act)

hypernym	:	swimming kick,
definition	:	a movement of the legs in swimming (noun.act)

part meronym	:	butterfly, butterfly stroke,
definition	:	a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down (noun.act)