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cog

noun
🔊/kɒɡ/
🔊/kɑːɡ/
 Idioms
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  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（齿轮的）轮齿，嵌齿
    Topics Engineeringc2
  2. (also cogwheel)
     a wheel with a series of teeth on the edge that fit between the teeth on the next wheel and cause it to move（齿轮的）轮齿，嵌齿
    3. Word OriginMiddle English: probably of Scandinavian origin and related to Swedish kugge and Norwegian kug.
Idioms
a cog in the machine/wheel
  1. (informal) a person who is a small part of a large organization（大机构中的）小职员，小成员