keep a straight face
Don't show one's feelings, especially refrain from laughing. For example, The school orchestra played so many wrong notes that I had trouble keeping a straight face. [Late 1800s]
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How to use keep a straight face in a sentence
In straight relationships with an age gap, words like ‘gold-digger’ and ‘trophy wife’ get thrown around.Freaking Out About Age Gaps in Gay Relationships Is Homophobic|Samantha Allen|January 9, 2015|DAILY BEAST
In that photo, Merabet has a big smile that spreads across his whole face and lights up his eyes.
Except the Braves did not win 14 straight pennants (they did win 14 straight division titles), and Smoltz is a also Republican.Conservative Curt Says His Politics, Not His Pitching, Kept Him Out of the Hall of Fame|Ben Jacobs|January 9, 2015|DAILY BEAST
Domestically, the prime minister maintains the dubious line that he is the only man who can keep the still-fragile peace.
Cassandra, whose hair has already begun to fall out from her court-mandated chemotherapy, could face a similar outcome.
It is most peculiar, and when he plays that way, the most bewitching little expression comes over his face.Music-Study in Germany|Amy Fay
Bernard stood there face to face with Mrs. Vivian, whose eyes seemed to plead with him more than ever.Confidence|Henry James
A Yankee, whose face had been mauled in a pot-house brawl, assured General Jackson that he had received his scars in battle.
With a suffocating gasp, she fell back into the chair on which she sat, and covered her face with her hands.The Pastor's Fire-side Vol. 3 of 4|Jane Porter
Joe looked at her with a smile, his face still solemn and serious for all its youth and the fires of new-lit hope behind his eyes.The Bondboy|George W. (George Washington) Ogden