Countersink Definition
 kountər-sĭngk 
  countersinking, countersinks, countersunk
  
    noun
  
 A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface.
 American Heritage 
A bit for countersinking holes.
 Webster's New World 
A countersunk hole.
 Webster's New World 
Synonyms: 
  - countersink bit
 - counterbore
 
    verb
  
 
    countersinking, countersinks, countersunk
  
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.
 Webster's New World 
To make a countersink on or in.
 American Heritage 
To sink the head of (a bolt, screw, etc.) into such a hole.
 Webster's New World 
To create such a conical recess.
 To countersink a hole for a screw.
 Wiktionary 
To cause to sink even with or below the surface.
 To countersink a screw or bolt into woodwork.
 Wiktionary 
Synonyms: 
  Countersink Is Also Mentioned In
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