n.
1.a hole (usually in wood) with the top part enlarged so that a screw or bolt will fit into it and lie below the surface
2.a bit for enlarging the upper part of a hole countersink v.
1.insert (a nail or screw below the surface, as into a countersink)
Idiom of the Day
have two strikes against one
to have two things working against one, to be in a difficult situation
The man already has two strikes against him and it will be very difficult for him to get the job.