n The point of the celestial sphere, directly opposite the zenith; inferior pole of the horizon; point of the celestial sphere directly under the place where we stand.
n (figuratively) The lowest point; time of greatest depression.
n (astronomy) The axis of a projected conical shadow; the direction of the force of gravity at a location; down.
n (beekeeping|archaic) An empty box added beneath a full one in a beehive to give the colony more room to expand or store honey.
v (transitive|beekeeping) To extend (a beehive) by adding an empty box at the base.