If you say something to someone's face, you say it openly in their presence.
Her opponent called her a liar to her face.
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to someone's face in British English
in someone's presence; directly and openly
I told him the truth to his face
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to someone's face in American English
in someone's presence; openly and without fear
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All related terms of 'to sb's face'
to laugh in someone's face
If someone laughs in your face , they are openly disrespectful towards you.
say something to someone's face
to say something openly in someone's presence, especially something critical or unpleasant
to shut the door in someone's face slam the door in someone's face
If someone shuts the door in your face or slams the door in your face , they refuse to talk to you or give you any information .
to be written all over someone's face be written across/on someone's face
If a feeling is written all over your face or is written across your face , it is very obvious to other people from your expression .
to wipe the smile off someone's face wipe the grin/smirk off sb's face
If you say that something wipes the smile off someone's face , you mean that it suddenly spoils their enjoyment or removes an advantage that they had and that you are pleased about it.