countersink definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
transitive verb countersunk, countersinking
- 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
- to sink the head of (a bolt, screw, etc.) into such a hole
- a bit for countersinking holes
- a countersunk hole
countersink definition by American Heritage Dictionary
- A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface.
- A tool for making such a hole.
- To make a countersink on or in.
- To drive (a screw or bolt) into a countersink.
single-flute countersink bit