Taivo A Taiwan Mandarin dictionary

老掉牙

lǎodiàoyá

ㄌㄠˇ ㄉㄧㄠˋ ㄧㄚˊ

  1. 1very old
  2. 2obsolete
  3. 3out of date

Keep 老掉牙 and it comes back until you know it.

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