“Watch your mouth”: idiom meaning.

Watch your mouth
Stop saying rude things to me. Be careful what you are saying to me because you are offending me or saying bad words.

Other examples of “Watch your mouth” idiom in a sentence

  • Watch your mouth! We don’t say bad words in this house.
  • Watch your mouth when you speak to your mother, young lady!
  • You’d better watch your mouth when you’re speaking to me!

“Watch your mouth”: use in context explanation

The man and his son have been to the supermarket and they’ve just come back home. The kid calls his mum and wants to tell her something important. The woman is angry at her husband and the husband tells his son to watch his mouth and not speak badly about his dad.