Wiktionary
box off
vb. (context nautical English) To turn the head of a vessel either way by brace the headyards aback.
Usage examples of "box off".
Logically I should push the black one and turn the box off, but memories of the pain kept intruding.
Then one of the men examined a number of heavily insulated electric wires that extended from the box off into the darkness where Tom and his companions could not discern them.
Galin pulled Sonea's box off the shelf and placed it on the desk in front of Regin.