英语"当面"有几种说法

to sb's face.
例如：
我太生气了, 我一定要当面告诉她我对她的看法。
I am so angry that I'll tell her to her face what I think of her.
in sb.'s presence
例如：
你不应该当面这么严厉地批评他。
You should not criticize him so harshly in his presence.

in sb's face
例如：每当谈到我开车违章判罪问题时，我妻子忍不住要以此事当面责备我。
Every time the subject of my motoring conviction comes up my wife can't help throwing it in my face.

face to face 面对面

on spot 当场

当面
in sb's presence, in the teeth, to the eye, to the teeth

do sth in one's face
当某人面做某事

in front 或知识 in front of
he said that in front of me.
他在我当面说着的。