Chinese edit

thief within a house or family; undiscovered traitor
 
disaster; distress; to scold
disaster; distress; to scold; difficult (to...); problem; difficulty; difficult; not good
to protect; to defend; to guard (against)
trad. (家賊難防) 家賊
simp. (家贼难防) 家贼

Pronunciation edit


Idiom edit

家賊難防

  1. it is difficult to guard against a thief within one's house; bad people from within are the most difficult to guard against