1. a gear tooth, formerly especially one of hardwood or metal, fitted into a slot in a gearwheel of less durable material.
2. a cogwheel.
3. a person who plays a minor part in a large organization, activity, etc.: He's just a small cog in the financial department.

4. (of an electric motor) to move jerkily.

5. to roll or hammer (an ingot) into a bloom or slab.

6. to make a blunder; err: One of the clerks must have slipped a cog.

1. to manipulate or load (dice) unfairly.

2. to cheat, especially at dice.

1. (in a cogged joint) the tongue in one timber, fitting into a corresponding slot in another.
2. a cluster of timber supports for a roof.

3. to join with a cog.

1. cognate.

1. any of the teeth or projections on the rim of a gearwheel or sprocket
2. a gearwheel, esp a small one
3. a person or thing playing a small part in a large organization or process

4. to roll (cast-steel ingots) to convert them into blooms

1. to cheat (in a game, esp dice), as by loading a dice

1. a tenon that projects from the end of a timber beam for fitting into a mortise

2. to join (pieces of wood) with cogs

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