扮豬吃老虎 [－猪－－－]

Jyutping baan6 zyu1 hek3 lou5 fu2
Pinyin bàn zhū chī lǎo hǔ

Definitions (CC-CEDICT)
  1. to play the wolf in sheep's clothing; to disguise oneself as sth harmless in order to lull one's target into letting their guard down
Definitions (CC-CANTO)
  1. people who put on a mask and pretend, but their real self will show during important moments; a wolf in sheep's clothing
Definitions (Wiktionary)
  1. phrase, idiomatic
    to play dumb to take advantage of someone
    (syn.) 扮猪食老虎, 扮豬食老虎