| 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 | - |
| 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 |