in astronomy, the withdrawing a star or planet, or rising below the horizon.

in the sea language. To set the land or the sun by the compass, is to observe how the land bears on any point of the compass, or on what point of the compass the sun is. Also when two ships fail in sight of one another, to mark on what point the chaced bears, is termed setting the chase by the compass.

among sportsmen, a term used to express the manner of taking partridges by means of a dog peculiarly trained to that purpose.