Khopeshes are somewhere between swords and axes in actual use, and aren't all that sharp. Some don't even have a true edge, and they don't have a thrusting point. However, they're still pretty narrow. I'd say that means a fairly concentrated application of force- IOW, slashing/cleaving. Not exactly blunt force trauma.
But if you really want to know for sure, contest the guys & gals at Sword Forum International. Several interesting threads about khopeshes there, like this one:
http://www.swordforum.com/forums/showthread.php?77893-Canaanite-Khopeshes