1. A hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface 
2. A bit for enlarging the upper part of a hole
   - counterbore, countersink bit

1. Insert (a nail or screw below the surface, as into a countersink)
   - set

Derived forms: countersank, countersunk, countersinking, countersinks

Type of: bit, bury, hole, sink

Encyclopedia: Countersink

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