'Perish' in the Bible

David also said, “As the Lord lives, surely the Lord will strike him, or his day will come that he dies, or he will go down into battle and perish.

Then David said to himself, “Now I will perish one day by the hand of Saul. There is nothing better for me than to escape into the land of the Philistines. Saul then will despair of searching for me anymore in all the territory of Israel, and I will escape from his hand.”