countersink


1coun·ter·sink

verb \ˈkan-tər-ˌsiŋk\
coun·ter·sunk\-ˌsəŋk\coun·ter·sink·ing

Definition of COUNTERSINK

transitive verb
1
:  to make a countersink on (a hole)
2
:  to set the head of (as a screw) at or below the surface

First Known Use of COUNTERSINK

1816

2countersink

noun

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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