'Watch' in the Bible
It was so on the next day, that Saul put the people in three companies; and they came into the midst of the camp in the morning watch, and struck the Ammonites until the heat of the day: and it happened, that those who remained were scattered, so that no two of them were left together.
Saul sent messengers to David's house, to watch him, and to kill him in the morning. Michal, David's wife, told him, saying, "If you don't save your life tonight, tomorrow you will be killed."
David said to Abner, "Aren't you a man? Who is like you in Israel? Why then have you not kept watch over your lord, the king? For one of the people came in to destroy the king your lord.
This thing isn't good that you have done. As Yahweh lives, you are worthy to die, because you have not kept watch over your lord, Yahweh's anointed. Now see where the king's spear is, and the jar of water that was at his head."