Answer: countersink

AnswerCrossword Clue
COUNTERSINKWoodworking technique
countersinkEnlarge and bevel the rim of (a drilled hole) so that a screw, nail, or bolt can be inserted flush with the surface
countersinkDrive (a screw, nail, or bolt) into such a hole
countersinkto make a countersink on (a hole)