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Jyutping sam1 hau2 bat1 jat1
Pinyin xīn kǒu bù yī

Definitions (CC-CEDICT)
  1. heart and mouth at variance (idiom); keeping one's real intentions to oneself
  2. saying one thing but meaning sth different
Definitions (Wiktionary)
  1. phrase, idiomatic
    cunning; hypocritical
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)