ㄖㄣˋㄗㄟˊㄗㄨㄛˋㄈㄨˋrènzéizuòfù

认贼作父
  1. 當作父親比喻賣身投靠敵人 不得已情況認賊作父情有可原」。

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