WORD MEANING
Countersink meaning
KOWN-ter-sink · verb
A conical hole cut into a material to allow the head of a screw or bolt to sit flush with or below the surface.
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A tool used to create a countersink hole.
To create a countersink hole in a material.
The term can refer to both the hole and the tool used to make it.
Examples
The carpenter will countersink the screws to make the surface smooth.
You need to countersink the holes before inserting the bolts.