p.p. & ·adj chamfered at the top;
said of a hole.
2. countersunk ·impf & ·p.p. of countersink.
3. countersunk ·p.p. & ·adj sunk into a chamfer; as, a countersunk bolt.
4. countersunk ·p.p. & ·adj beveled on the lower side, so as to fit a chamfered countersink; as, a countersunk nailhead.