countersink

[ verb, noun koun-ter-singk; verb also koun-ter-singk ]

/ verb, noun ˈkaʊn tərˌsɪŋk; verb also ˌkaʊn tərˈsɪŋk /

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See synonyms for countersink on Thesaurus.com

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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Origin of countersink

First recorded in 1810–20; counter- + sink

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use countersink in a sentence

The greatest diameter of the countersunk head may be one and a half, and its depth a half of the diameter of the rivet.
An Introduction to Machine Drawing and Design|David Allan Low
As this process reverses the hinge, the screw holes must be countersunk on the opposite side.
The Boy Mechanic, Book 2|Various
Binding posts are placed in the corners of the base in holes countersunk from the under side for the screw heads.
The Boy Mechanic, Book 2|Various
Each compartment is equipped with a follower block and countersunk rod for holding guides.
Cyclopedia of Commerce, Accountancy, Business Administration, v. 1|Various

It is fixed in position by slightly rebating the edge of the door and fastening with ordinary countersunk brass screws.
Woodwork Joints|William Fairham

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

countersink

Origin of countersink

Words related to countersink

How to use countersink in a sentence

British Dictionary definitions for countersink