'Piece' in the Bible

And a certain woman cast a piece of a millstone upon Abimelech's head, and all to brake his skull.

So Delilah took new ropes and tied him with them and said to him, "The Philistines are here, Samson!" (The Philistines were hiding in the bedroom.) But he tore the ropes from his arms as if they were a piece of thread.

Now on the fourth day they got up early in the morning, and he prepared to go; and the girl’s father said to his son-in-law, “Sustain yourself with a piece of bread, and afterward you may go.”