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sei kein Spielverderber

don't be a spoilsport

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phrase Rare #47,516
don't be a spoilsport An informal imperative addressed to one person using du. Spielverderber literally means someone who spoils the game or fun; the phrase is also commonly translated as “don’t be a party pooper.”
GE: Sei kein Spielverderber und komm mit uns tanzen!
EN: Don’t be a spoilsport—come dancing with us!

Sei kein Spielverderber, Olson.

Don't be a spoilsport, Olson.

— The Long Walk - Todesmarsch (2025)

Sei kein Spielverderber!

Don't be a spoilsport!

Sei kein Spielverderber, gib ihn ihm.

Don't be a spoilsport, give it to him.

— Iwans Kindheit (1962)