'Sinketh' in the Bible

and David putteth forth his hand unto the vessel, and taketh thence a stone, and slingeth, and smiteth the Philistine on his forehead, and the stone sinketh into his forehead, and he falleth on his face to the earth.

And they take Jeremiah, and cast him into the pit of Malchiah son of the king, that is in the court of the prison, and they send down Jeremiah with cords; and in the pit there is no water, but mire, and Jeremiah sinketh in the mire.