countersink

Fetched 2026-10-26 (cache).

Synonyms: countersunk, countersank, countermine, countering, counterline, countersign, countersigns, countersinks, countersuing, counterpin

Antonyms: countersunk, countersank, countermine, countering, counterline, countersign, countersigns, countersinks, countersuing, counterpin

Related words from Datamuse; suggestions, not definitions.

Noun

1. A [[conical]] [[recess]], typically [[machine]]d 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. {{ng|(Also used, at less depth, for edge-breaking/deburring.)}}

Verb

1. {{lb|en|transitive}} To create such a conical recess.
2. {{lb|en|ambitransitive}} To cause to sink even with or below the surface.

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.