coun·​ter·​sink | \ ˈkau̇n-tər-ˌsiŋk How to pronounce countersink (audio) \
countersunk\ ˈkau̇n-​tər-​ˌsəŋk How to pronounce countersunk (audio) \; countersinking

Definition of countersink

 (Entry 1 of 2)

transitive verb

1 : to make a countersink on (a hole)
2 : to set the head of (something, such as a screw) at or below the surface



Definition of countersink (Entry 2 of 2)

1 : a bit or drill for making a funnel-shaped enlargement at the outer end of a drilled hole
2 : the enlargement made by a countersink

Illustration of countersink

Illustration of countersink


countersink 1

In the meaning defined above

Examples of countersink in a Sentence

Recent Examples on the Web: Noun

If screw heads sit slightly above the surface, remove, countersink, and screw back in. The Editors Of House Beautiful, House Beautiful, "How to Fix Scratched and Creaky Floorboards," 11 Feb. 2015

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'countersink.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of countersink


1816, in the meaning defined at sense 1


1816, in the meaning defined at sense 1

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The first known use of countersink was in 1816

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Rhyming Dictionary: Words that rhyme with countersink

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What made you want to look up countersink? Please tell us where you read or heard it (including the quote, if possible).


appealing forcibly to the mind or reason

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