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countersink

[ verb, noun koun-ter-singk; verb also koun-ter-singk ]
/ verb, noun 藞ka蕣n t蓹r藢s瑟艐k; verb also 藢ka蕣n t蓹r藞s瑟艐k /
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verb (used with object), coun路ter路sank, coun路ter路sunk, coun路ter路sink路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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Origin of countersink

First recorded in 1810鈥20; counter- + sink
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, 漏 Random House, Inc. 2022

How to use countersink in a sentence

British Dictionary definitions for countersink

countersink
/ (藞ka蕣nt蓹藢s瑟艐k) /

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 漏 William Collins Sons & Co. Ltd. 1979, 1986 漏 HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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