The Collaborative International Dictionary of English v.0.48:

Pommel \Pom"mel\, v. t. [imp. & p. p. Pommeledor Pommelled;
   p. pr. & vb. n. Pommeling or Pommelling.]
   To beat soundly, as with the pommel of a sword, or with
   something knoblike; hence, to beat with the fists. [Written
   also pummel.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pummel \Pum"mel\, n. & v. t.
   Same as Pommel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pummel
    v 1: strike, usually with the fist; "The pedestrians pummeled
         the demonstrators" [syn: pummel, pommel, biff]

Moby Thesaurus II by Grady Ward, 1.0:

59 Moby Thesaurus words for "pummel":
   bang, baste, bastinado, batter, beat, belabor, belt, birch, buffet,
   cane, club, cowhide, cudgel, cut, drub, flagellate, flail, flap,
   flog, fustigate, give a whipping, give the stick, hammer, heat,
   horsewhip, knock, knout, lace, lambaste, larrup, lash, lay on,
   maul, paste, patter, pelt, pistol-whip, pommel, pound, pulverize,
   rap, rawhide, scourge, sledgehammer, smite, spank, strap, stripe,
   swinge, switch, thrash, thresh, thump, trounce, truncheon, wallop,
   whale, whip, whop