long in the tooth
年齡太大,已經(jīng)不再幼稚或有活力的
口語·形容人或物年老
英文釋義
old or aged
例句
My dog is getting long in the tooth, but he still loves to play fetch every morning.
典故來源
源自馬匹年齡判斷:馬年紀(jì)越大,牙齦萎縮,牙齒顯得更長。