I. ˈkau̇n-tər-ˌsiŋk transitive verb
( coun·ter·sunk -ˌsəŋk ; -sink·ing )
Date: 1816
1. : to make a countersink on (a hole)
2. : to set the head of (as a screw) at or below the surface
II. noun
Date: 1816
1. : a bit or drill for making a funnel-shaped enlargement at the outer end of a drilled hole
2. : the enlargement made by a countersink
[
countersink 1
]