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What does countersink mean?

Looking for the meaning or definition of the word countersink? Here's what it means.

Noun
  1. a cylindrical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.
Verb
  1. (transitive) To create such a conical recess.
  2. (transitive) To cause to sink even with or below the surface.
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