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Any insect of the order Diptera; characterized by having two wings (except for some wingless species), also called true flies.
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(non-technical) Especially, any of the insects of the family Muscidae, such as the common housefly (other families of Diptera include mosquitoes and midges).
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Any similar, but unrelated insect such as dragonfly or butterfly.
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A lightweight fishing lure resembling an insect.
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A chest exercise performed by moving extended arms from the sides to in front of the chest. (also flye)
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A witch's familiar.
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A parasite.
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The butterfly stroke (plural is normally flys)
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(preceded by definite article) A simple dance in which the hands are shaken in the air, popular in the 1960s.