The Collaborative International Dictionary
Disserve
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.
Have neither served nor disserved the interests of any
party.
--Jer. Taylor.
Wiktionary
disserve
vb. To treat poorly; to do a disservice to