Maranatha

1382, from Gk. maranatha, untranslated Sem. word in the Bible (I Cor. xvi.22), where it follows Gk. anathema, and therefore has been taken as part of a phrase and used as "a curse." Usually assumed to be from Aramaic maran atha "Our Lord has come," which would make the common usage erroneous (cf. OED entry), but possibly it is a false transliteration of Heb. mohoram atta "you are put under the ban," which would make more sense in the context.