开门揖盗（開門揖盜）　

◎ 开门揖盗 kāimén-yīdào

(1) [flinge open the door and invite the robbers]∶开了门引强盗进来

(2) [invite disaster by letting in evildoers]∶外来的祸患由自己招致

开门揖盗,弃好即仇。——《南史》