- a young female horse.
- Informal. a girl or young woman.
Origin of filly
1400–50; late Middle English fyly < Old Norse fyla female foal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for filly
But on May 30, Jackson announced he would not enter his filly, claiming she “deserves a well-earned vacation.”Can These Two Horses Save Racing?
June 4, 2009
So, calling to his wife, the two of them together, tried their skill to catch the filly.Welsh Fairy Tales
William Elliott Griffis
She kept striking her side—she fancied it was a help to the filly.
Where his fellow man had withheld, the filly had given her all and questioned not.
How long he stayed there, the filly nuzzling him like a mother, he did not know.
The handlers fell back in silence as Garrison approached the filly.
- a female horse or pony under the age of four
- informal, rare a spirited girl or young woman
C15: from Old Norse fylja; related to Old High German fulihha; see foal
Word Origin and History for filly
c.1400, fyly, possibly from Old Norse fylja, fem. of foli "foal" (see foal (n.)). Slang sense of "young girl" is from 1610s.
Online Etymology Dictionary, © 2010 Douglas Harper