Counterbore
[koun-ter-bawr, -bohr; koun-ter-bawr, -bohr] /ˈkaʊn tərˌbɔr, -ˌboʊr; ˈkaʊn tərˈbɔr, -ˈboʊr/
noun
1.
a tool for enlarging a drilled hole for a portion of its length, as to permit sinking a screw head.
2.
the portion of the hole so enlarged.
verb (used with object), counterbored, counterboring.
3.
to enlarge (a drilled hole) along part of the length of the hole by drilling with a bit having a greater diameter.
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