cog

US /kɑːɡ/
UK /kɑːɡ/
"cog" picture
1.

a wheel or bar with a series of projections around its edge, which transfers motion by engaging with projections on another wheel or bar

:
The broken cog prevented the machine from working.
Each cog in the clockwork mechanism is essential.
2.

a subordinate person in a large organization

:
He felt like a small cog in a giant machine.
Every cog in the company plays a role, no matter how small.
1.

to engage a cog with another to transmit motion

:
The engineer carefully cogged the gears together.
The machine needs to be properly cogged for optimal performance.