long in the tooth

形容词 adj.
中文释义

英文释义

形容词 adj.
  1. Old; aged. idiomatic
    — His cousin was now of more than middle age. . . . She was lean, and yellow, and long in the tooth.

词源

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.
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