Strong cider.

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1865.  The genuine Virginia stimulant known as apple-jack, or apple whisky.—N.Y. Tribune. (N.E.D.)

2

1885.  If there was a barrel, yes, a half-barrel, or a runlet of “apple jack” or “peach brandy” “within a league,” they would find it with absolute certainty.—‘Southern Hist. Soc. Papers,’ xiii. 142.

3