Meanings
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1
noun
a young female horse, especially one below the age at which it is called a mare
The chestnut filly stayed close to her mother in the pasture.
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2
noun
dated and often offensive: a young woman, especially when spoken of as attractive
The novel's narrator repeatedly calls young women fillies, a usage now considered demeaning.
Thesaurus
Etymology
From Old Norse fylja, 'young female horse,' related to foal. The later slang use for a young woman transfers an animal term to a person and is now generally dated and objectifying.