'Watch' in the Bible

When the strong man armed keeps watch over his house, then his goods are safe:

And they kept watch on him, and sent out secret representatives, who were acting the part of good men, in order that they might get something from his words, on account of which they might give him up to the government and into the power of the ruler.

But keep watch at all times with prayer, that you may be strong enough to come through all these things and take your place before the Son of man.