Meaning

• A tooth on a gear.

• A gear; a cogwheel.

• An unimportant individual in a greater system.

• A projection or tenon at the end of a beam designed to fit into a matching opening of another piece of wood to form a joint.

• One of the rough pillars of stone or coal left to support the roof of a mine.

Meaning

• To furnish with a cog or cogs.