A basin used for holding water for washing.

A drain for carrying off wastewater.

(geology) A sinkhole.

A depression in land where water collects, with no visible outlet.

A heat sink.

A place that absorbs resources or energy.

(ecology) A habitat that cannot support a population on its own but receives the excess of individuals from some other source.

(uncountable) A term used in baseball to describe the motion of a sinker pitch, which refers to the descending motion or descent of the pitch.

(computing, programming) An object or callback that captures events; an event sink.

(graph theory) A destination vertex in a transportation network.

(graph theory) A node in directed graph for which all of its edges go into it; one with no outgoing edges.

An abode of degraded persons; a wretched place.

A depression in a stereotype plate.

(theater) A stage trapdoor for shifting scenery.

(mining) An excavation smaller than a shaft.

(game development) One or several systems that remove currency from the game's economy, thus controlling or preventing inflation.

(heading, physical) Descend or submerge into a liquid, cause a vessel to become submerged, push something into something, create by digging or delving, and pot a ball into a pocket or hole in snooker, pool, billiards, or golf.

(heading, social) Diminish or be diminished, experience apprehension or disappointment, cause decline or degradation, and demean or lower oneself.

(transitive, slang) To drink (especially something alcoholic).

(transitive, slang) To pay absolutely.

(intransitive) To be overwhelmed or depressed; to fail in strength.

(intransitive) To decrease in volume, as a river; to subside; to become diminished in volume or in apparent height.