countersink ( synonym found)
Definition of countersink:

(n) : a conical recess, typically machined around a hole to admit a screw so that it sits flush with a surface
(v) : to create such a conical recess
Definition of countersink:

(n) : a conical recess, typically machined around a hole to admit a screw so that it sits flush with a surface
(v) : to create such a conical recess
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