1. to enlarge the upper part of a drilled hole so that the head of a screw or bolt will lie flush with or below the surface
Usage: carpentry; construction

1. a conical recess made around a hole, especially to receive the head of a screw or bolt
Usage: carpentry; construction
2. a tool used to make a countersink
Usage: carpentry; construction

Examples

• The carpenter will countersink the screws so they don’t stick out.
• Make sure to countersink each bolt head properly.
• The countersink allows the screw head to sit flush with the wood surface.
• He used a countersink to create the proper recess for the fastener.
• The countersink bit made clean, precise holes in the metal.
• Each countersink was drilled to the exact depth needed.