noun, plural fil·lies.

  1. a young female horse.
  2. Informal. a girl or young woman.

noun plural -lies

  1. a female horse or pony under the age of four
  2. informal, rare a spirited girl or young woman

c.1400, fyly, possibly from Old Norse fylja, fem. of foli “foal” (see foal (n.)). Slang sense of “young girl” is from 1610s.

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