背はい泳えいはいえいMeanings1nounbackstrokeRefers to the backstroke swimming stroke. Often used in compound form 背泳ぎ (せおよぎ) in everyday speech, but 背泳 is common in sports contexts.See also: 背泳ぎ彼かれは背はい泳えいの選せん手しゅだ。He is a backstroke swimmer.背はい泳えいの練れん習しゅうを始はじめた。I started practicing the backstroke.