'Sinking' in the Bible

David put his hand into his bag and took out a stone and slung it, and it struck the Philistine on his forehead. The stone penetrated his forehead, and he fell face down on the ground.

I am sinking in deep mire, and there is no solid ground. I have come into deep water, and the flood overwhelms me.

Rising up to the sky, sinking down to the depths,their courage melting away in anguish,