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countersink definition

counter·sink (ko̵unt′ər siŋk′)

transitive verb countersunk -·sunk′, countersinking -·sink′·ing

  1. to enlarge the top part of (a hole in metal, wood, etc.) so that the head of a bolt, screw, etc. will fit flush with or below the surface
  2. to sink the head of (a bolt, screw, etc.) into such a hole

noun

  1. a bit for countersinking holes
  2. a countersunk hole

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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