'Off' in the Bible

And he made ten basins. And he set five on the south and five on the north in which to wash; they washed off the work of the burnt offering in them, but the sea [was] for the priests to wash therein.

This is the thing that you must do: one third of you priests and Levites {coming off duty on the Sabbath} [shall be] gatekeepers at the entrances

And the Levites and all Judah did according to all that Jehoiada the priest commanded. And they each took his men [who were] {coming off duty on the Sabbath} with {the ones going out to duty on the Sabbath}, for Jehoiada the priest did not dismiss the working groups.

he took counsel with his commanders and his mighty warriors to block off the waters of the springs that [came] from outside the city, and they helped him.

Then many people were gathered, and they blocked off all the springs and the river that flowed through the midst of the land, saying, "Why should the kings of Assyria come and find much water?"

And this same Hezekiah blocked off the flow of the waters of the upper Gihon, and directed them down the west [side] of the city of David. And Hezekiah prospered in all his works.