ALL meanings of counter-sinking
count·er-sink
C c - verb with object counter-sinking to enlarge the upper part of (a cavity), especially by chamfering, to receive the cone-shaped head of a screw, bolt, etc. 1
- verb with object counter-sinking to cause (the head of a screw, bolt, etc.) to sink into a prepared depression so as to be flush with or below the surface. 1
- noun counter-sinking a tool for countersinking a hole. 1
- noun counter-sinking a countersunk hole. 1