Definition of countersink
countersunk
play \ˈkau̇n-tər-ˌsəŋk\;countersinking
transitive verb
1 : to make a countersink on (a hole)
2 : to set the head of (something, such as a screw) at or below the surface
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First Known Use of countersink
1816
2
countersink
noun
coun·ter·sink
Definition of countersink
1 : a bit or drill for making a funnel-shaped enlargement at the outer end of a drilled hole
2 : the enlargement made by a countersink
Illustration of countersink
First Known Use of countersink
1816
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