唾面自干

tuòmiàn-zìgān

[drain the cup of humiliation; extreme obsequiousness as one who in spat on the face and let dry without wiping] 人家往自己脸上吐唾沫, 不擦掉而让它自干。 指受了侮辱, 极度容忍, 不加反抗, 也指人不知羞耻