countersink
[ verb, noun koun-ter-singk; verb also koun-ter-singk ]
/ verb, noun ˈkaʊn tərˌsɪŋk; verb also ˌkaʊn tərˈsɪŋk /
verb (used with object), coun·ter·sank, coun·ter·sunk, coun·ter·sink·ing.
to enlarge the upper part of (a cavity), especially by chamfering, to receive the cone-shaped head of a screw, bolt, etc.
to cause (the head of a screw, bolt, etc.) to sink into a prepared depression so as to be flush with or below the surface.
noun
a tool for countersinking a hole.
a countersunk hole.
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
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British Dictionary definitions for countersink
countersink
/ (ˈkaʊntəˌsɪŋk) /
verb -sinks, -sinking, -sank or -sunk (tr)
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
noun
Also called: countersink bit a tool for countersinking
a countersunk depression or hole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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