subs. phr. (Winchester College).—1.  A large leathern jug for beer, holding two gallons. The term was not peculiar to Winchester; in olden times JACKS were common everywhere.

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  [?].  Simon the Cellarer.

        But oh, oh, oh! his nose doth show,
How oft the BLACK JACK to his lips doth go.

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  1630.  TAYLOR (‘The Water Poet’), Workes, i. 113.

        Nor of BLACKE IACKS at gentle Buttry bars,
Whose liquor oftentimes breeds houshold wars.

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  c. 1696.  B. E., A New Dictionary of the Canting Crew, s.v., BLACKJACK, a Leather-Jug to drink in.

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  2.  (old).—A black leather jacket (1512).

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  3.  (American).—Rum sweetened with molasses: with or without water.

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  4.  (American).—A face blackened by difficulty of breathing; as the cause of such a face, hanging (BARTLETT).

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  1862.  New York Observer, 5 June. If the rebel troops become guerillas, they will have to be hung. The BLACKJACKS will be far more fatal to them than yellow jack was to our troops.

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