What does “shut your mouth” mean?

a rude way of telling sb to be quiet or stop talking

How is “shut your mouth” used?

In American History X (1998), one line is: “Sit your ass down. No. Sit down. Shut your mouth.”

The clip at the top of this page is from American History X (1998).

Sit your ass down. No. Sit down. Shut your mouth.

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