笑裡藏刀 [－里－－]

Jyutping siu3 leoi5 cong4 dou1
Pinyin xiào lǐ cáng dāo

Definitions (CC-CEDICT)
  1. lit. a dagger hidden in smiles (idiom); friendly manners belying hypocritical intentions
  2. when the fox preaches, look to the geese
Definitions (Wiktionary)
  1. phrase, idiomatic
    to act in a friendly manner with hypocritical intentions; to be a wolf in sheep's clothing
    (syn.) 面浪笑呵呵, 肚里毒蛇窠, 肚裡毒蛇窠