Definition of "watch one's mouth" in English

Verb

1. To be careful about what one says, especially with regard to disrespectful or profane language.

   • You really need to watch your mouth. You're a teacher now!

2. In the imperative form, used as a warning to choose one's words carefully or else be silent, for fear of consequences.

   • Hey. Watch your mouth. Don't you realize who's listening?