Definition of backswimmer
: an aquatic bug (family Notonectidae) that swims on its back
Recent Examples of backswimmer from the Web
The 0.01-inch-long water flea is able to change its body into a bigger (and thus more inedible) shape when threatened by a predator, like the tiny backswimmer, says Anne Estes, a microbiologist at the University of Maryland School of Medicine.
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