FromMiddle Englishforcursien, fromOld Englishforcursian(“to curse, curse up”), equivalent tofor- +curse.
forcurse (third-person singular simple presentforcurses,present participleforcursing,simple past and past participleforcursed)
- (archaic, transitive) Tocurse utterly or completely; place under a heavy curse.
1894, Henry Duff Traill,Social England:The bishops were ever cursing them, but they cared nought therefor, for they were allforcursed and forsworn and forlorn [...]