1

countersink

verb coun·ter·sink \ ˈkau̇n-tər-ˌsiŋk \

Definition of countersink

countersunk play \ˈkau̇n-tər-ˌsəŋk\; countersinking
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

First Known Use of countersink

1816


2

countersink

noun

Definition of countersink

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

First Known Use of countersink

1816


Learn More about countersink


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

to fix or define the limits of

Get Word of the Day daily email!

Test Your Vocabulary

Namesakes Word Quiz

  • a-citrus-fruit-possibly-named-after-a-person
  • Which of the following is a fruit named after a Moroccan seaport?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

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!