noun. A hole with the top part enlarged so that the head of a screw or bolt will lie flush with or below the surface.

noun. A tool for making such a hole.

transitive verb. To make a countersink on or in.

transitive verb. To drive (a screw or bolt) into a countersink.

noun. A drill or brace-bit for countersinking, variously made, according as it is to be used on wood, iron, brass, etc.

noun. An enlargement of a hole to receive the head of a screw or bolt.

noun. The recess in the chamber of a gun into which the rim of the cartridge fits.

To form by drilling or turning, as a cavity in timber or other materials, for the reception of the head of a bolt or screw, a plate of iron, etc., in order that it may be nearly or quite flush with the surface: as, to countersink a hole for a screw.

To cause to sink in any other body so as to be nearly or quite flush with its surface: as, to countersink a screw or bolt by making a depression for its head.

noun. An enlargement of the upper part of a hole, forming a cavity or depression for receiving the head of a screw or bolt.

noun. A drill or cutting tool for countersinking holes.

transitive verb. To chamfer or form a depression around the top of (a hole in wood, metal, etc.) for the reception of the head of a screw or bolt below the surface, either wholly or in part.

transitive verb. To cause to sink even with or below the surface.

noun. a conical recess, typically machined around a hole to admit a screw so that it sits flush with a surface.

verb. to create such a conical recess.

noun. a bit for enlarging the upper part of a hole

verb. insert (a nail or screw below the surface, as into a countersink)

noun. 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

"Drills are to be procured from the various dealers, but can be made from steel wire softened in the fire and filed to a sharp three-cornered point -- afterwards tempered to hardness -- for the smaller eggs, or filed up for the larger eggs to the pattern of a "countersink" used for wood; indeed, the smallest-sized"

counterbore  countersunk bolt  sink  spotface  

countersinking  countersunk  

bit  bury  hole  sink  

1-in  one-thousandth  rhombus  steam-pipe  workpiece  

countersank  countersunk  

countersank  countersinking  countersinks