countersink

verb
coun·​ter·​sink | \ˈkau̇n-tər-ˌsiŋk \
countersunk\ ˈkau̇n-​tər-​ˌsəŋk \; 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

countersink

noun

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

Noun

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

Verb

1816, in the meaning defined at sense 1

Noun

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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