Definition of aflap
: flapping
a bird with wings aflap … the white marble rotunda of the Council of Lords sat like a fat iced wedding cake, aflap with pennants bearing the insignias of each noble family.— Toby Bishop, Airs Beneath the Moon, 2007
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Merriam-Webster unabridged
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Time Traveler for aflap
The first known use of aflap was in 1877
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