Definition of watch one's mouth in English:

watch one's mouth

informal Be careful about what one says: you’d better watch your mouth, mate, or we’ll have you
More example sentences
  • In the locker-room, too, he will have to watch his mouth.
  • After warning him to watch his mouth once again he walked off with his dogs.
  • I know damn well what I'm saying, and no way in hell am I watching my mouth.
See parent entry: mouth

Definition of watch one's mouth in:

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Word of the day flippant
Pronunciation: ˈflɪp(ə)nt
adjective
not showing a serious or respectful attitude