| sink | (noun) plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe | - |
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| (noun) a covered cistern; waste water and sewage flow into it | Synonyms: cesspit, cesspool, sump |
| (noun) 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 |
| (noun) (technology) a process that acts to absorb or remove energy or a substance from a system | - |
| (verb) fall heavily or suddenly; decline markedly | Synonyms: fall off, slump |
| (verb) embed deeply | Synonyms: bury |
| (verb) go under | Synonyms: go down, go under, settle |
| (verb) fall or descend to a lower place or level | Synonyms: drop, drop down |
| (verb) cause to sink | - |
| (verb) fall or sink heavily | Synonyms: slide down, slump |
| (verb) appear to move downward | Synonyms: dip |
| (verb) descend into or as if into some soft substance or place | Synonyms: subside |
| (verb) pass into a specified state or condition; sink into | Synonyms: lapse, pass |
| sinkable | (adjective) capable of being sunk | - |
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| sinker | (noun) a pitch that curves downward rapidly as it approaches the plate | - |
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| (noun) a weight that sinks (as to hold nets or fishing lines under water) | - |
| (noun) a small ring-shaped friedcake | Synonyms: donut, doughnut |
| sinkhole | (noun) 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: sink, swallow hole |
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| sinking | (noun) a descent as through liquid (especially through water) | - |
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| (noun) a slow fall or decline (as for lack of strength) | - |
| (noun) a feeling caused by uneasiness or apprehension | Synonyms: sinking feeling |