To sharpen.

God judgeth the righteous, and God is angry with the wicked every day. If he turn not, he will WHET his sword; he hath bent his bow, and made it ready. He hath also prepared for him the instruments of death; he ordaineth his arrows against the persecutors. ( Psalm 7:12 )

Source: A King James Dictionary. (Used with permission. Copyright © Philip P. Kapusta)

Bibliography Information

"Entry for 'Whet'". A King James Dictionary.