Source : Webster's Revised Unabridged Dictionary (1913)

Mishandle \Mis*han"dle\, v. t.
   To handle ill or wrongly; to maltreat.

Source : WordNet®

mishandle
     v 1: make a mess of, destroy or ruin; "I botched the dinner and
          we had to eat out"; "the pianist screwed up the
          difficult passage in the second movement" [syn: {botch},
           {bumble}, {fumble}, {botch up}, {muff}, {blow}, {flub},
           {screw up}, {ball up}, {spoil}, {muck up}, {bungle}, {fluff},
           {bollix}, {bollix up}, {bollocks}, {bollocks up}, {bobble},
           {louse up}, {foul up}, {mess up}, {fuck up}]
     2: manage badly or incompetently; "The funds were mismanaged"
        [syn: {mismanage}, {misconduct}]