Source : Webster's Revised Unabridged Dictionary (1913)

Tippler \Tip"pler\, n.
   1. One who keeps a tippling-house. [Obs.] --Latimer.

   2. One who habitually indulges in the excessive use of
      spirituous liquors, whether he becomes intoxicated or not.

Source : WordNet®

tippler
     n : someone who drinks liquor repeatedly in small quantities
         [syn: {social drinker}]