countersunken

countersink

[v., n. koun-ter-singk; v. also koun-ter-singk]
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:
1810–20; counter- + sink

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
countersink (ˈkaʊntəˌsɪŋk)
 
vb , -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
 
n
3.  Also called: countersink bit a tool for countersinking
4.  a countersunk depression or hole

Collins English Dictionary - Complete & Unabridged 10th Edition
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