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/ˈdɪəflʌɪ/ · noun
Any of various species of fly which feed on deer, principally in genus Chrysops..
When the sun comes out, it is totally delightful, except for the mosquitoes, and the blackflies, and the deerflies.
The basement was flooded and the couch was growing mildew, so we sat outdoors in the shadows of the trees in a screened tent with deerflies and mosquitoes buzzing outside.
It was not a horsefly and it was not a deerfly; it was bigger than either.
Use deer fly when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Deer fly means Any of various species of fly which feed on deer, principally in genus Chrysops..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
When the sun comes out, it is totally delightful, except for the mosquitoes, and the blackflies, and the deerflies.
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