SINK (3)

Sink, n. 1. 1. A drain to carry off filthy water; a jakes.
2. 2. 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.
3. 3. A hole or low place in land or rock, where waters sink and are lost; — called also sink hole.
Sink hole. (a) The opening to a sink drain. (b) A cesspool. (c) Same as Sink, n., 3.