Taivo A Taiwan Mandarin dictionary

倒灌

dàoguàn

ㄉㄠˋ ㄍㄨㄢˋ

  1. 1to flow backwards (of water, because of flood, tide, wind etc)
  2. 2reverse flow
  3. 3to back up (sewage)

Keep 倒灌 and it comes back until you know it.

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