with objectTo serve badly or unfaithfully; to do a disservice to; to mistreat.
Origin
Middle English; earliest use found in Ayenbite of Inwyt. Perhaps originally from Anglo-Norman and Old French messervir from mes- + servir; in later use probably independently from (or reinforced by) mis- + serve.
Definition of mis-serve in US English:
mis-serve
verbˌmɪsˈsəːv
rare
with objectTo serve badly or unfaithfully; to do a disservice to; to mistreat.
Origin
Middle English; earliest use found in Ayenbite of Inwyt. Perhaps originally from Anglo-Norman and Old French messervir from mes- + servir; in later use probably independently from (or reinforced by) mis- + serve.