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countersink

[v., n. koun-ter-singk; v. also koun-ter-singk] /v., n. ˈkaʊn tərˌsɪŋk; v. also ˌkaʊn tərˈsɪŋk/
verb (used with object), countersank, countersunk, countersinking.
1.
to enlarge the upper part of (a cavity), especially by chamfering, to receive the cone-shaped head of a screw, bolt, etc.
2.
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
3.
a tool for countersinking a hole.
4.
a countersunk hole.
Origin
1810-1820
1810-20; counter- + sink
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for counter sunken

countersink

/ˈkaʊntəˌsɪŋk/
verb (transitive) -sinks, -sinking, -sank, -sunk
1.
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
2.
to drive (a screw) or sink (a bolt) into such an enlarged hole
noun
3.
Also called countersink bit. a tool for countersinking
4.
a countersunk depression or hole
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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