The Amorites, and the Hittites, etc. The nations of Canaan proper, to whom the Gergashites are sometimes added. See the comment on 2 Samuel 3:8. I will cut them off. Or "cut them down," i.e; destroy them from being any longer nations, but not exterminate them, as is generally supposed.
David had a "Hittite" among his "mighty men" (2 Samuel 23:39), and was on friendly terms with Araunah the "Jebusite" (2 Samuel 24:18-24).