breaststroke /ˈbrɛstˌstroʊk/ noun Learner's definition of BREASTSTROKE
[singular]
: a way of swimming in which the swimmer's face is in the water and the arms move in a large motion from front to back as the feet kick outward
also : a race in which the swimmers do the breaststroke蛙泳；蛙泳比赛