The Collaborative International Dictionary of English v.0.48:

Booze \Booze\ (b[=oo]z), v. i. [imp. & p. p. Boozed
   (b[=oo]zd); p. pr. & vb. n. Boozing.] [D. buizen; akin to
   G. bausen, and perh. fr. D. buis tube, channel, bus box,
   jar.]
   To drink greedily or immoderately, esp. alcoholic liquor; to
   tipple. [Written also bouse, and boose.] --Landor.
   [1913 Webster]

         This is better than boozing in public houses. --H. R.
                                                  Haweis.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Booze \Booze\, n.
   1. A carouse; a drinking. --Sir W. Scott.
      [1913 Webster]

   2. any alcoholic beverage, especially a strong beverage such
      as whiskey.
      [PJC]

WordNet (r) 3.0 (2006):

booze
    n 1: an alcoholic beverage that is distilled rather than
         fermented [syn: liquor, spirits, booze, hard drink,
         hard liquor, John Barleycorn, strong drink]
    v 1: consume alcohol; "We were up drinking all night" [syn:
         drink, booze, fuddle]