/ kɒg; NAmE kɑːg/ noun
1.
one of a series of teeth on the edge of a wheel that fit between the teeth on the next wheel and cause it to move
—picture at cogwheel
2.
= cogwheel
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IDIOMS
- a cog in the machine / wheel
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WORD ORIGIN
Middle English : probably of Scandinavian origin and related to Swedish kugge and Norwegian kug .