(ˈ)mi(s)+ verb
Etymology: Middle English misseyen, missayen, from mis- (I) + seyen, sayen to say — more at say
transitive verb
: to speak evil of : slander
rebuked, reviled, missaid thee — Alfred Tennyson
intransitive verb
: to say something wrong or incorrect
knew … what the press … would missay , misunderstand, understate, and exaggerate about him — H.S.Canby