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Jyutping zeoi2 him3
Pinyin zuǐ qiàn

Definitions (Wiktionary)
  1. adj, colloquial
    prone to say something that one should not say; having a misbehaving mouth

嘴欠 [--]

Jyutping
Pinyin zuǐ qiàn

Definitions (CC-CEDICT)
  1. (coll.) unable to control one's tongue
  2. prone to say sth nasty