back·stroke 
/ˈbækˌstroʊk/ noun
/ˈbækˌstroʊk/ noun [singular] : a way of swimming in which a person floats in the water facing upward while kicking the legs and rotating the arms
▪ She got into the pool and began to do the backstroke. ; also : a race in which the swimmers do the backstroke
▪ She won the 50-meter backstroke.
▪ She got into the pool and began to do the backstroke. ; also : a race in which the swimmers do the backstroke
▪ She won the 50-meter backstroke.
