cog
/kɔɡ/ noun C1- A tooth on a gear.
- A gear; especially, a cogwheel.
- An unimportant individual in a greater system. · just a cog in the machine
- 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.
Plural cogs
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