To close one’s mouth.

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1799.  Instead of saying grace decently, as he used to do, he called out attention—handle arms—and for grace after dinner—now shut pans.Mass. Spy, Jan. 2.

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1833.  Shut pan, and sing dumb, or I’ll throw you into the drink.—J. K. Paulding, ‘The Banks of the Ohio,’ i. 213 (Lond.).

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1833.  If I didn’t make ’em shut their pans quicker than a flash of lightning.—Id., ii. 92.

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1835.  I shut pan on the subject, and fell to eating my dinner.—‘Col. Crockett’s Tour,’ p. 102.

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1841.  No one rose. No one broke silence. Shut pan seemed to be the word of command on the left side of this chamber.—Mr. Benton of Missouri, U.S. Senate, July 7: Cong. Globe, p. 123, App.

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1853.  Spicer raised his hand to stop the speech, but the lawyer wouldn’t shut pan, till a look brought Joe White’s rifle to his cheek.—S. A. Hammett (‘Philip Paxton’), ‘A Stray Yankee in Texas,’ p. 139.

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1855.  “Now jest stop, Axy,” said he, “jest shet pan now I tell ye; and don’t open your face again.”—C. W. Philleo, ‘Twice Married,’ Putnam’s Mag., vi. 246/1 (Sept.).

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