to fall by, or as by, the force of gravity; to descend lower and lower; to decline gradually; to subside; as, a stone sinks in water; waves rise and sink; the sun sinks in the west.-to enter deeply; to fall or retire beneath or below the surface; to penetrate.-hence, to enter so as to make an abiding impression; to enter completely.-to be overwhelmed or depressed; to fall slowly, as so the ground, from weakness or from an overburden; to fail in strength; to decline; to decay; to decrease.-to decrease in volume, as a river; to subside; to become diminished in volume or in apparent height.-to cause to sink; to put under water; to immerse or submerge in a fluid; as, to sink a ship.-figuratively: to cause to decline; to depress; to degrade; hence, to ruin irretrievably; to destroy, as by drowping; as, to sink one's reputation.-to make (a depression) by digging, delving, or cutting, etc.; as, to sink a pit or a well; to sink a die.-to bring low; to reduce in quantity; to waste.-to conseal and appropriate.-to keep out of sight; to suppress; to ignore.-to reduce or extinguish by payment; as, to sink the national debt.-a drain to carry off filthy water; a jakes.-a shallow box or vessel of wood, stone, iron, or other material, connected with a drain, and used for receiving filthy water, etc., as in a kitchen.-a hole or low place in land or rock, where waters sink and are lost; -- called also sink hole.