'Watch' in the Bible

Now on the day after, Saul put the people into three bands, and in the morning watch they came to the tents of the Ammonites, and they went on attacking them till the heat of the day: and those who were not put to death were put to flight in every direction, so that no two of them were together.

Then in that night Saul sent men to David's house to keep watch on him so as to put him to death in the morning: and David's wife Michal said to him, If you do not go away to a safe place tonight you will be put to death in the morning.

And Saul said to him, Why have you made designs against me with the son of Jesse, giving him food and a sword and getting directions from the Lord for him, and helping him to take up arms against me, and to be on the watch to make a secret attack on me as he is doing now?

And David said to his men, Put on your swords, every one of you. And every man put on his sword; and David did the same; and about four hundred men went up with David, and two hundred kept watch over their goods.

And David said to Abner, Are you not a man of war? is there any other like you in Israel? why then have you not kept watch over your lord the king? for one of the people came in to put the king your lord to death.

What you have done is not good. By the living Lord, death is the right fate for you, because you have not kept watch over your lord, the man on whom the Lord has put the holy oil. Now see, where is the king's spear, and the vessel of water which was by his head?