扮猪吃老虎

bàn zhū chī lǎo hǔ

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

扮

bàn

to disguise oneself as

猪

zhū

hog

吃

chī

variant of 吃[chi1]

老

lǎo

prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity

虎

hǔ

tiger