| Noun | 1. | sink - plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe |
| 2. | 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" Antonyms: source - (technology) a process by which energy or a substance enters a system; "a heat source"; "a source of carbon dioxide" | |
| 3. | sink - 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 | |
| 4. | sink - a covered cistern; waste water and sewage flow into it | |
| Verb | 1. | sink - fall or drop to a lower place or level; "He sank to his knees" |
| 2. | sink - cause to sink; "The Japanese sank American ships in Pearl Harbor" | |
| 3. | sink - pass into a specified state or condition; "He sank into Nirvana" | |
| 4. | sink - go under, "The raft sank and its occupants drowned" | |
| 5. | sink - descend into or as if into some soft substance or place; "He sank into bed"; "She subsided into the chair" Synonyms: subside | |
| 6. | sink - appear to move downward; "The sun dipped below the horizon"; "The setting sun sank below the tree line" Synonyms: dip | |
| 7. | sink - fall heavily or suddenly; decline markedly; "The real estate market fell off" | |
| 8. | sink - fall or sink heavily; "He slumped onto the couch"; "My spirits sank" Synonyms: slide down, slump | |
| 9. | sink - embed deeply; "She sank her fingers into the soft sand"; "He buried his head in her lap" Synonyms: bury |
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