countersink — English Dictionary

Noun

1. A conical recess, typically machined at the mouth of a hole to admit a screw (with a matching taper) so that the screw sits flush with a surface.

2. The cutter used to cut such a recess. (Also used, at less depth, for edge-breaking/deburring.)

   Synonyms

   countersinker

   Broader terms

   cuttercutting tool

   Examples

   Holonym: center drill (combined drill and countersink)

Verb

1. To create such a conical recess.

   Usage

   • Transitive

   Examples

   to countersink a hole for a screw

2. To cause to sink even with or below the surface.

   Usage

   • Transitive or intransitive

   Examples

   to countersink a screw or bolt into woodwork

   I countersank into the locust just enough to make the nailhead flush.

Noun

1. a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface

   Broader terms

   hole

2. a bit for enlarging the upper part of a hole

   Synonyms

   counterborecountersink bit

   Broader terms

   bit

Verb

1. insert (a nail or screw below the surface, as into a countersink)

   Synonyms

   set

   Broader terms

   burysink