Loose lips sink ships
![American World War II poster by Seymour R. Goff, also known as Ess-ar-gee.](/Images/godic/202501/24/Loose_lips_might_sink_ships2339.jpg")
Loose lips sink ships is an American English idiom meaning "beware of unguarded talk".
The phrase originated on propaganda posters during World War II. The phrase was created by the War Advertising Council and used on posters by the United States Office of War Information.