'Off' in the Bible

"'Then the priest will write these curses on a scroll and then scrape them off into the bitter water.

and the slope of the valleys that extends to the dwelling of Ar, and falls off at the border of Moab."

Balaam said to Balak, "Station yourself by your burnt offering, and I will go off; perhaps the Lord will come to meet me, and whatever he reveals to me I will tell you." Then he went to a deserted height.