That which is known by most people, and thus cannot reasonably be contested.

Having a covering of small knobs.

Any of a class of multi-function pocket knives or multitools, having a blade and various tools, such as screwdrivers and can openers.

As far as I know.

The action of striking one's own knee with the hand, associated with hearty laughter.

Alternative form of knockabout

a verbal emulation of a knocking sound

A large, sharp knife, used by the butcher for hacking meats.

a tanto (Japanese knife)

A knife, usually with a fixed double-edged blade, that is carried inside a sheath or attached to a boot.