Source : Webster's Revised Unabridged Dictionary (1913)

Misdo \Mis*do"\, v. t. [imp. {Misdid}; p. p. {Misdone}; p. pr. &
   vb. n. {Misdoing}.] [AS. misd?n. See {Do}, v.]
   1. To do wrongly.

            Afford me place to show what recompense To wards
            thee I intend for what I have misdone. --Milton.

   2. To do wrong to; to illtreat. [Obs.] --Chaucer.

Misdo \Mis*do"\, v. i.
   To do wrong; to commit a fault.

         I have misdone, and I endure the smart.  --Dryden.

Source : WordNet®

misdo
     v : do wrongly or improperly; "misdo one's job"