countersink

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

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: Verb With the drill press and a 5/32-inch-diameter bit, bore and countersink pilot holes in each block. Neal Barrett, Popular Mechanics, 14 Nov. 2020 Attach legs: Hold each rear leg in place and countersink two evenly spaced holes through the seat slat and into the top of the leg. Ted Kilcommons, Popular Mechanics, 18 July 2020 Lay out the holes first and drill and countersink them. Popular Science, 9 Aug. 2020 Now, assemble per the photo and countersink the screws. 💡When decorating, avoid a high-gloss paint or finish, which is so slick the bags will slide off the board. Popular Mechanics Editors, Popular Mechanics, 11 Apr. 2020 Recent Examples on the Web: Noun Drill two evenly spaced holes through the joint with a 3⁄8-inch countersink bit, and fasten with 1-inch screws. Ted Kilcommons, Popular Mechanics, 18 July 2020 If screw heads sit slightly above the surface, remove, countersink, and screw back in. The Editors Of House Beautiful, House Beautiful, 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.

See More

First Known Use of countersink

Verb

1816, in the meaning defined at sense 1

Noun

1816, in the meaning defined at sense 1

Keep scrolling for more

Learn More about countersink

Time Traveler for countersink

Time Traveler

The first known use of countersink was in 1816

See more words from the same year

Statistics for countersink

Cite this Entry

“Countersink.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/countersink. Accessed 12 Jun. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

WORD OF THE DAY

Test Your Vocabulary

Name that Thing: Dog Breeds

How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!