1. pledge or solemnly promise (one's faith or loyalty): archaic"men to plighted vows were faithful"
▪ be engaged to be married to.archaic
Word OriginOld Englishplihtan ‘endanger’, of Germanic origin; related to Dutch plicht and German Pflicht ‘duty’. The current sense is recorded only from Middle English, but is probably original, in view of the related Germanic words.