Taivo A Taiwan Mandarin dictionary

滴水不漏

dīshuǐbùlòu

ㄉㄧ ㄕㄨㄟˇ ㄅㄨˋ ㄌㄡˋ

  1. 1lit. not one drop of water can leak out
  2. 2watertight
  3. 3rigorous (argument)

Keep 滴水不漏 and it comes back until you know it.

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