'Watch' in the Bible

"Look among the nations, watch, and wonder marvelously; for I am working a work in your days, which you will not believe though it is told you.

Watch out! For I am bringing in the Chaldeans, that cruel and impetuous people, who sweep across the earth dispossessing people from homes not their own.

I will stand upon my watch, and set me upon the tower, and will watch to see what he will say unto me, and what I shall answer when I am reproved.