cog
noun /kɒɡ/
/kɑːɡ/
Idioms - enlarge imageone 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 - (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
词源Middle English: probably of Scandinavian origin and related to Swedish kugge and Norwegian kug.
Idioms
a cog in the machine/wheel
- (informal) a person who is a small part of a large organization
（大机构中的）小职员，小成员