knife

A cutting instrument consisting of a sharp blade attached to a handle.

A cutting edge; a blade.

To use a knife on, especially to stab; wound with a knife.

To betray or attempt to defeat by underhand means.

To cut or slash a way through something with or as if with a knife.

(under the knife) Undergoing surgery.

A cutting-instrument consisting of a comparatively short blade and a handle, adapted for easy use with the hand.

In a wider sense, any small cutting-tool, or any part of a tool or machine having a sharp edge for cutting or scraping: as, the knives of a mowing-machine, printing-press, meat-chopper, straw-cutter, etc.

A sword or cutlas; a long cutting-weapon.

A saddlers’ cutting-tool with a sharp convex edge.