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Jyutping seon3 hau2
Pinyin xìn kǒu

Definitions (CC-CEDICT)
  1. to blurt sth out
  2. to open one's mouth without thinking
Definitions (Wiktionary)
  1. adv
    thoughtlessly
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Wiktionary)
  1. Mandarin
    信口雌黄
    信口雌黃
    xìn kǒu cí huáng
    • to make irresponsible remarks (lit. to correct someone with at will)