Source : Webster's Revised Unabridged Dictionary (1913)

Mistreat \Mis*treat"\, v. t.
   To treat amiss; to abuse.

Source : WordNet®

mistreat
     v : treat badly; "This boss abuses his workers"; "She is always
         stepping on others to get ahead" [syn: {maltreat}, {abuse},
          {ill-use}, {step}, {ill-treat}]