[1] : WordNet (r) 2.0

beat up
     v 1: give a beating to; subject to a beating, either as a
          punishment or as an act of aggression; "thugs beat him
          up when he walked down the street late at night"; "the
          teacher used to beat the students" syn: beat, work
          over
     2: gather; "drum up support" syn: drum up, rally
see also:
beat work over drum up rally 

[2] : Moby Thesaurus II by Grady Ward, 1.0

139 moby thesaurus words for "beat up":
   agitate, all in, batter, battered, beat, beat-up, beaten,
   beaten up, bedraggled, blowzy, bone-weary, broken-down, bruise,
   bushed, careless, chintzy, churn, churn up, clabber, clot,
   coagulate, colloid, colloidize, convulse, cream, curdle, dead,
   dead-and-alive, dead-tired, deadbeat, decrepit, derelict,
   dilapidated, disarrange, discompose, disquiet, disturb, dog-tired,
   dog-weary, done, done in, done up, drabbletailed, draggled,
   draggletailed, drained, emulsify, emulsionize, excite, exhausted,
   fagged out, ferment, flurry, fret, frowzy, frumpish, frumpy, gone,
   grubby, in rags, in ruins, incrassate, informal, inspissate, jell,
   jellify, jelly, knocked out, loose, lopper, lumpen, messy, mussy,
   negligent, paddle, perturb, perturbate, played out, poky, pooped,
   pooped out, prostrate, ragged, raggedy, ramshackle, ready to drop,
   rile, ripple, roil, roughen, ruffle, ruined, ruinous, rumple,
   run-down, scraggly, seedy, shabby, shake, shake up, shoddy, slack,
   slatternly, slipshod, sloppy, slovenly, slummy, sluttish, sordid,
   spent, squalid, stir, stir up, swirl, tacky, tattered, thicken,
   thrash soundly, tired out, tired to death, tottery, trouble,
   tuckered out, tumbledown, unkempt, unneat, unsightly, untidy,
   upset, used up, washed-up, weary unto death, whacked, whip,
   whip up, whisk, wiped out, work up, worn-out

Ball Up >> B Words
Ball Up, definition of term: Ball Up
ball+up_pag1.html

Bang Up >> B Words
Bang Up, definition of term: Bang Up
bang+up_pag1.html

Backed Up >> B Words
Backed Up, definition of term: Backed Up
backed+up_pag1.html

Back Up >> B Words
Back Up, definition of term: Back Up
back+up_pag1.html

Ante Up >> A Words
Ante Up, definition of term: Ante Up
ante+up_pag1.html

Act Up >> A Words
Act Up, definition of term: Act Up
act+up_pag1.html