hallow: [OE] Hallow is essentially the same word as holy. The noun, as in Halloween, the eve of All Hallows, or All Saints, comes from a noun use of Old English Hālig, which as an adjective developed into modern English holy; and the verb was formed in prehistoric Germanic times from the root *khailag-, source also of holy. => holy[hallow etymology, hallow origin, 英语词源]