1. do not talk, keep quiet. Usage example: "Shut up!"he yelled at the dog. "Be quiet or I'll muzzle you!"
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2.verb (informal) To stop talking. For example: Little Ruthie told Father about his birthday surprise before Mother could shut her up. Often used as a command; usually considered rude. For example: Shut up and let Joe say something. Or: If you'll shut up for a minute, I'll tell you our plan. Synonym: BUTTON YOUR LIP, DRY UP, KEEP ONE'S MOUTH SHUT. To close the doors and windows of. For example: We got the house shut up only minutes before the storm hit. To close and lock for a definite period of time. For example: The Smiths always spend Labor Day shutting up their summer home for the year. Or: We got to the store only to find that the owner had shut up shop for the weekend. To confine. For example: That dog bites. It should be shut up. Or: John has been shut up with a cold all week.
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3. do not talk, keep quiet; "Shut up!" he yelled at the dog. "Be quiet or I'll muzzle you!"