Noun

• S: (n) sink (plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe)
• S: (n) sink ((technology) a process that acts to absorb or remove energy or a substance from a system) "the ocean is a sink for carbon dioxide"
• S: (n) sinkhole, sink, swallow hole (a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof)
• S: (n) cesspool, cesspit, sink, sump (a covered cistern; waste water and sewage flow into it)

Verb

• S: (v) sink, drop, drop down (fall or descend to a lower place or level) "He sank to his knees"
• S: (v) sink (cause to sink) "The Japanese sank American ships in Pearl Harbor"
• S: (v) sink, pass, lapse (pass into a specified state or condition) "He sank into nirvana"
• S: (v) sink, settle, go down, go under (go under) "The raft sank and its occupants drowned"
• S: (v) sink, subside (descend into or as if into some soft substance or place) "He sank into bed"; "She subsided into the chair"
• S: (v) dip, sink (appear to move downward) "The sun dipped below the horizon"; "The setting sun sank below the tree line"
• S: (v) slump, fall off, sink (fall heavily or suddenly; decline markedly) "The real estate market fell off"
• S: (v) slump, slide down, sink (fall or sink heavily) "He slumped onto the couch"; "My spirits sank"
• S: (v) bury, sink (embed deeply) "She sank her fingers into the soft sand"; "He buried his head in her lap"