Game-face definitions

An athlete's facial expression during or just before competition, when it indicates resolution and concentration.

Put on your game face and get to work.

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(idiomatic) The expression of one who is prepared for or is facing a lot of difficult and/or undesirable work, especially when it is imminent.

The editor told his star reporter to put his game face on, because he was going to cover a potentially hours-long city council meeting where they were going to discuss the controversial issue and tempers were expected to flare.

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(idiomatic) A facial expression used to prevent giving away one's emotions.
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