Keep a straight face
Meaning
To prevent oneself from laughing or showing any sign of amusement, especially in a situation where seriousness or solemnity is required.
Origin
The phrase's origin is quite literal, drawing directly from the physical act of trying to control one's facial muscles to suppress laughter. Imagine a poker player, holding a winning hand, their lips pressed together and brows unfurrowed, every muscle straining to maintain an unreadable expression as they hide their triumph. This vivid, physical imagery of literally 'straightening' the face to conceal amusement solidified into a common idiom by the 19th century, capturing the universal struggle to maintain composure when something is hilariously inappropriate or demands a serious demeanor. It's a simple, direct command to oneself, or another, to literally iron out any tell-tale signs of mirth.
Examples
- It was almost impossible for the comedian to keep a straight face during his own joke, but he managed to deliver the punchline without cracking a smile.
- Despite the absurdity of the situation, the judge had to keep a straight face and maintain decorum in the courtroom.