The Collaborative International Dictionary of English v.0.48:

Tipple \Tip"ple\, v. t.
   1. To drink, as strong liquors, frequently or in excess.
      [1913 Webster]

            Himself, for saving charges,
            A peeled, sliced onions eats, and tipples verjuice.
                                                  --Dryden.
      [1913 Webster]

   2. To put up in bundles in order to dry, as hay.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tipple \Tip"ple\, n.
   Liquor taken in tippling; drink.
   [1913 Webster]

         Pulque, the national tipple of Mexico.   --S. B.
                                                  Griffin.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Tipple \Tip"ple\, n. [Cf. 3d Tip.]
   An apparatus by which loaded cars are emptied by tipping;
   also, the place where such tipping is done.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Tipple \Tip"ple\, v. i. [imp. & p. p. Tippled; p. pr. & vb. n.
   Tippling.] [From tip a small end, or a word akin to it; cf.
   Norw. tipla to tipple, to drip, Prov. E. tip, tiff, tift, a
   draught of liquor, dial. G. zipfeln to eat and drink in small
   parts. See Tip a point, and cf. Tipsy.]
   To drink spirituous or strong liquors habitually; to indulge
   in the frequent and improper used of spirituous liquors;
   especially, to drink frequently in small quantities, but
   without absolute drunkeness.
   [1913 Webster]

         Few of those who were summoned left their homes, and
         those few generally found it more agreeable to tipple
         in alehouses than to pace the streets.   --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

tipple
    n 1: a serving of drink (usually alcoholic) drawn from a keg;
         "they served beer on draft" [syn: draft, draught,
         potation, tipple]
    v 1: drink moderately but regularly; "We tippled the cognac"
         [syn: tipple, bib]

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "tipple":
   aqua vitae, bib, booze, budge, drain the cup, dram, drink,
   drink bottoms-up, drink deep, drink hard, drink in, drink off,
   drink to, drink up, firewater, follow strong drink, gargle, grog,
   guzzle, hooch, imbibe, juice, knock back, lap, lap up, liquor up,
   nip, pledge, pull, quaff, sip, soak, spirits, suck, suck in,
   suckle, sup, swig, swill, tank up, toast, tope, toss down,
   toss off, wash down