I. |kau̇ntə(r)+ transitive verb
( countersunk “+|səŋk ; countersunk ; countersinking ; countersinks )
Etymology: counter- + sink
1. : to make a countersink on (a hole)
2. : to set the head of (as a screw) at or below the surface especially by means of a countersink
II. ˈ ̷ ̷ ̷ ̷+ˌ- noun
1. : a funnel-shaped enlargement at the outer end of a drilled hole usually for the reception of a screw, bolt, or rivet head
2. : a bit or drill for making such an enlargement — compare counterbore
[s]counters.jpg[/s]