A corruption of Sabbath day, erroneously used for Sunday.

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1833.  [He] makes poetry himself sabbadays, made more poetry an’ you could shake a stick at.—John Neal, ‘The Down-Easters,’ i. 135.

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1833.  Id., i. 45. [See HALVES, THE.]

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1834.  He used to go to the North meeting three times every Sabba’day.Vermont Free Press, Aug. 9.

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1848.  Capting, I sorter recking it ain’t entered into your kalkilation as this here is Sabberday.—W. E. Burton, ‘Waggeries,’ p. 16 (Phila.).

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a. 1848.  There is nothing irregular in nature, because it is round, as I told you last Sabberdy.—Dow, Jun., ‘Patent Sermons,’ i. 194.

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