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Pronunciation varies by accent · noun
Any of various aquatic insects, of the family Notonectidae, that swim on their backs..
Use backswimmer when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Backswimmer means Any of various aquatic insects, of the family Notonectidae, that swim on their backs..
Common synonyms include notonecta undulata.
The opposite depends on the specific sense.
Use backswimmer where its definition matches the intended context.
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