There are more meaning to the word "sink" than you may think...
Sink: to fall, drop, or descend gradually to a lower level. Drown
Sink: to cause to penetrate: to sink an ax into a tree trunk.
Sink: to bury, plant, or lay (a pipe, conduit, etc.) into or as if into the ground.
Sink: to bite deeply or vigorously; sink one's teeth into; take a bite
Sink: to do or enter into with great enthusiasm, concentration, conviction, etc.: to sink my teeth into solving the problem.
Sink: a place of vice or corruption. Den of iniquity.
Sink: a basin or receptacle, as in a kitchen or laundry, usually connected with a water supply and drainage system, for washing dishes, clothing, your hands, etc.