poker face

US /ˈpoʊkər feɪs/
UK /ˈpoʊkər feɪs/
"poker face" picture
1.

an impassive expression that hides one's true feelings or intentions

:
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Despite the bad news, she maintained a perfect poker face.
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He tried to keep a poker face during the negotiation, but I could see his excitement.
:
deadpanblank expressionstraight faceimpassive faceexpressionless face
:
face-to-facefacefacingin the face ofon the face of itface powderface mask