2. to set the head of (something, such as a screw) at or below the surface
3. a bit or drill for making a funnel-shaped enlargement at the outer end of a drilled hole
4. the enlargement made by a countersink
counter sunk 例句
英汉例句
All holes in the base of the chassis have been counter sunk to protect the screws from damage when going over kerbs or when the car bottoms out over bumps.