long in the tooth
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long in the tooth
Where it comes from
Possibly from the practice of examining the length of horses’ teeth when estimating their ages: an old horse has long, rectangular incisors, and their occlusion angle is steep. Compare don't look a gift horse in the mouth.
adjective
- Old; aged. His cousin was now of more than middle age. . . . She was lean, and yellow, and long in the tooth.
