Filly definitions

fĭl'ē
A young female horse, especially a racehorse less than five years old, or a young female of another equine species.
noun
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A young female horse, specif. one under five years of age.
noun
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A lively, high-spirited girl or young woman.
noun
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A vivacious young woman or girl.
noun
14
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A young female horse.
noun
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(dated) A young attractive female.

Hey, Homer, get a load of the gams on that filly!

noun
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Origin of filly

Middle English filli from Old Norse fylja pau-1 in Indo-European roots