The Collaborative International Dictionary of English v.0.48:

Disserve \Dis*serve"\, v. t. [imp. & p. p. Di?????; p. pr. &
   vb. n. Disserving.] [Pref. dis- + serve: cf. F. desservir.]
   To fail to serve; to do injury or mischief to; to damage; to
   hurt; to harm.
   [1913 Webster]

         Have neither served nor disserved the interests of any
         party.                                   --Jer. Taylor.
   [1913 Webster]