hone

A sharpening stone composed of extra-fine grit used for removing the burr or curl from the blade of a razor or some other edge tool.

A machine tool used in the manufacture of precision bores.

To sharpen with a hone; to whet.

To use a hone to produce a precision bore.

To refine (a skill especially) by learning.

He also honed the procedure known as cut and fill - whereby the spoil from railway cuttings was used to build up embankments.

Huh? Training in your room under the torchlight / Hone that form to get you ready for the big fight

To make more acute, intense, or effective.

A kind of swelling in the cheek.