The Collaborative International Dictionary of English v.0.48:

Usquebaugh \Us"que*baugh\, n. [Ir. or Gael. uisge beatha,
   literally, water of life; uisge water + beatha life; akin to
   Gr. bi`os life. See Quick, a., and cf. Whisky.]
   [1913 Webster]
   1. A compound distilled spirit made in Ireland and Scotland;
      whisky.
      [1913 Webster]

            The Scottish returns being vested in grouse, white
            hares, pickled salmon, and usquebaugh. --Sir W.
                                                  Scott.
      [1913 Webster]

   2. A liquor compounded of brandy, or other strong spirit,
      raisins, cinnamon and other spices. --Brande & C.
      [1913 Webster]