| countersink | (noun) a bit for enlarging the upper part of a hole | Synonyms: counterbore, countersink bit |
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| (noun) a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface | - |
| 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 | - |