Meaning of the word "careless talk costs lives" in English

What does "careless talk costs lives" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

careless talk costs lives

US /ˈker.ləs tɔːk kɑːsts laɪvz/
UK /ˈkeə.ləs tɔːk kɒsts laɪvz/
"careless talk costs lives" picture

Idiom

a warning that speaking about sensitive or secret information can have dangerous or fatal consequences

Example:
During the war, posters everywhere reminded soldiers that careless talk costs lives.
In the world of corporate espionage, remember that careless talk costs lives—or at least jobs.