認ㄖㄣˋrèn賊ㄗㄟˊzéi作ㄗㄨㄛˋzuò父ㄈㄨˋfù

  1. 譏諷不明事理而將仇敵當作親人。比喻甘心投靠敵人。如：「那般貪官汙吏，人面獸心，認賊作父，真是令人不齒。」似認敵為友、認賊為子反大義滅親

英lit. to acknowledge the bandit as one's father (idiom)​; fig. a complete betrayal, to sell oneself to the enemy
德jemandem (dem Gegner )​ in die Hände arbeiten (S)​