• a covered cistern; waste water and sewage flow into it
• plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe
• a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof
• (technology) a process that acts to absorb or remove energy or a substance from a system; "the ocean is a Sink for carbon dioxide"
• fall heavily or suddenly; decline markedly; "The real estate market fell off"
• embed deeply; "She sank her fingers into the soft sand"; "He buried his head in her lap"
• descend into or as if into some soft substance or place; "He sank into bed"; "She subsided into the chair"
• pass into a specified state or condition; "He sank into Nirvana"
• fall or drop to a lower place or level; "He sank to his knees"
• cause to Sink; "The Japanese sank American ships in Pearl Harbor"
• fall or Sink heavily; "He slumped onto the couch"; "My spirits sank"
• go under, "The raft sank and its occupants drowned"
• appear to move downward; "The sun dipped below the horizon"; "The setting sun sank below the tree line"

'Sink' in other languages