Brewer's: Colt's-tooth

The love of youthful pleasure. Chaucer uses the word “coltish” for skittish. Horses have at three years old the colt's-tooth. The allusion is to the colt's teeth of animals, a period of their life when their passions are strongest.

Her merry dancing-days are done; She has a colt's-tooth still, I warrant.

King: Orpheus and Eurydice

Well said, Lord Sands; Your colt's-tooth is not cast yet.

Shakespeare: Henry VIII., 1.3.

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