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Jyutping mui6 seoi2
Pinyin mèi shuǐ

Definitions (Wiktionary)
  1. verb, Min-Dong, Min-Nan
    to dive; to be under water
    (syn.) 潜水, 秤錘沬, 鑽水沬, 伥沬, 秤锤沬, 倀沬, 𩑦沕子, 藏水沬, 降水沬, 踮水沬, 潛水, 沉沬, 射沕子, 沕水, 钻水沬
  2. verb, Min-Dong
    to hold one's breath under water