This phrase, which is disappearing, is equivalent to “a caution to snakes.”

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1833.  The way he fights is a sin to Crockett.—‘Sketches of D. Crockett,’ p. 30 (N.Y.).

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1835.  Well now the way that ar’ cotton goes, is a sin to Crockett!—Ingraham, ‘The South-West,’ i. 140.

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1838.  “Ay, ay, sir; it’s a sin to Moses, such a trade” [as mine is, said the stoker].—E. Flagg, ‘The Far West,’ i. 71.

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1848.  The way she gulped arterwards, and stared, and twisted her fishy mouth, was a sin to Davy Crockett.—W. E. Burton, ‘Waggeries,’ p. 22 (Phila.).

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1853.  There was fifes and fiddles, brass horns and everything, and the way they puffed their jaws and worked their arms was no sin to Moses.—A Hoosier at a Fancy Ball: Daily Herald, St. Louis, May 20.

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1861.  The way some of your city wags stuff our honest clodhoppers is a sin to Moses.Oregon Argus, March 23.

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