counterbore
transitive verb
coun·ter·bore
| \ ¦kau̇ntə(r)+\
Definition of counterbore
(Entry 1 of 2)
: to form a counterbore in : enlarge (part of a hole) by means of a counterbore
counterbore
nounDefinition of counterbore (Entry 2 of 2)
1
: a flat-bottomed enlargement of the mouth of a cylindrical bore
2
: a drill for making a counterbore — compare countersink
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