Meaning of countersink

coun•ter•sink

Pronunciation: (v., n.koun'tur-singk"v.also koun"tur-singk'), [key]
— v., n. -sank, -sunk, -sink•ing,
—v.t.
  1. to enlarge the upper part of (a cavity), esp. by chamfering, to receive the cone-shaped head of a screw, bolt, etc.
  2. to cause (the head of a screw, bolt, etc.) to sink into a prepared depression so as to be flush with or below the surface.
—n.
  1. a tool for countersinking a hole.
  2. a countersunk hole.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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