En svensk tiger
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En svensk tiger (English: "A Swedish tiger" or "A Swede keeps his mouth shut") was a Swedish propaganda campaign (Tystnadskampanjen) during World War II, encouraging secrecy towards foreigners. Svensk can mean both Swedish and Swede while tiger could be read as either the animal or "keeps his mouth shut", giving the poster the double meaning "a Swedish tiger" and "a Swede keeps his mouth shut." Comparable in use to "loose lips sink ships" in the US.
The famous poster for the propaganda campaign was created by Bertil Almqvist in 1941.