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WordReference Random House Unabridged Dictionary of American English © 2024coun•ter•sink (v., n. koun′tər singk′;v. also koun′tər singk′),USA pronunciation v., -sank, -sunk, -sink•ing, n. v.t. - Buildingto enlarge the upper part of (a cavity), esp. by chamfering, to receive the cone-shaped head of a screw, bolt, etc.
- Buildingto cause (the head of a screw, bolt, etc.) to sink into a prepared depression so as to be flush with or below the surface.
n. - Buildinga tool for countersinking a hole.
- Buildinga countersunk hole.
Collins Concise English Dictionary © HarperCollins Publishers:: countersink /ˈkaʊntəˌsɪŋk/ vb ( -sinks, -sinking, -sank, -sunk)(transitive)- to enlarge the upper part of (a hole) in timber, metal, etc, so that the head of a bolt or screw can be sunk below the surface
- to drive (a screw) or sink (a bolt) into such an enlarged hole
n - Also called: countersink bit a tool for countersinking
- a countersunk depression or hole
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