stand guard
stand watch
keep guard ,
stand sentinel

I will go with you myself, and stand watch outside your door.

I would be happy to stand watch through the night.

Now, I would have to stand watch myself all night.

It would be better if she could stand her watch.

"The two of you will stand watch while the women sleep."

"We have to work out a way for us to stand watch."

They were the special concerns of those who must stand watch.

"I can have a couple of boys stand watch if you like."

"And just who decided I needn't stand watch last night?"

Wake me in four hours, then I will stand watch.