What is the meaning of sink?

noun

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

verb

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