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backswimmer

[bak-swim-er]
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.
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Origin of backswimmer

First recorded in 1860–65; back1 + swimmer
Also called boat bug.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018