Meaning : Refrain from divulging sensitive information. Keep quiet about confidential information.
Example :
Don't tell him any secrets--he cannot keep his mouth shut!.
Synonyms : keep one's mouth shut, keep quiet
Divulge confidential information or secrets.
Be careful--his secretary talks.Shut one's mouth ka meaning, vilom shabd, paryayvachi aur samanarthi shabd in Marathi. Shut one's mouth ka matlab kya hota hai?