backswimmer

/bak-swim-er/US // ˈbækˌswɪm ər //

仰卧起坐者,仰卧起坐的人,仰泳者,仰卧起坐

Definitions

n.名词 noun

1
- : any of numerous predaceous aquatic hemipterous insects, of the family Notonectidae, that swim on their backs, and may inflict a painful bite if handled.