O.E. wyrresta, from P.Gmc. *wers-ista- (cf. O.S. wirsista, O.N. verstr, O.Fris. wersta, O.H.G. wirsisto), superlative of PIE *wers- "to confuse, mix up" (see
worse). The verb meaning "damage, inflict loss upon" is first recorded c.1600, from the adj. Phrase in the worst way