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[verb, noun koun-ter-singk; verb koun-ter-singk] /verb, noun ˈkaʊn tərˌsɪŋk; verb ˌkaʊn tərˈsɪŋk/
verb (used with object), countersank, countersunk, countersinking.
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.
a tool for countersinking a hole.
a countersunk hole.
Origin of countersink
First recorded in 1810-20; counter- + sink Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for countersink
Historical Examples
  • countersink this hole enough to allow the head to sink flush with the surface.

    Handwork in Wood

    William Noyes
  • countersink the holes on the side from which the screws enter.

    Toy Craft Leon H. Baxter
  • Bore all holes, where shown in the drawing, and countersink them.

    Toy Craft Leon H. Baxter
  • countersink all holes, except the four holes which hold the supports for the cart handle.

    Toy Craft Leon H. Baxter
  • countersink the hole in the base on the under side with a 1/2-in.

  • By using round-head screws it was unnecessary to countersink the metal.

  • Be sure to countersink the holes for the heads of the bolts.

  • The term is also applied to the tool with which the countersink is formed.

    Time Telling through the Ages Harry Chase Brearley
  • Bore and countersink four holes for 11⁄4-inch flat-head screws.

    Carpentry and Woodwork

    Edwin W. Foster
  • The countersink, which is a drill made to fit in the bit-stock, and bores a hole the shape and depth of the screw-head.

    The Boy Craftsman A. Neely Hall
British Dictionary definitions for countersink


verb (transitive) -sinks, -sinking, -sank, -sunk
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
Also called countersink bit. a tool for countersinking
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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