Water-boatman meaning

Any of various aquatic hemipteran insects of the family Corixidae, having long oarlike hind legs used for swimming.
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A backswimmer.
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Any of a family (Corixidae) of hemipterous water bugs that swim about in ponds and streams by vigorous movement of the fringed, oarlike hind legs.
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Any of various aquatic insects of the family Corixidae that have paddle-shaped hind legs used for swimming.
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