cog
noun [ C ] uk/kɒɡ/ us/kɑːɡ/
（齿轮的）嵌齿，轮齿
one of the tooth-like parts around the edge of a wheel in a machine that fits between those of a similar wheel, causing both wheels to move
(also cogwheel)齿轮
a wheel with cogs around its edge, used to turn another wheel or part in a machine
Idiom
a cog in a/the machineidiom disapproving （大机构中的）小职员；不可或缺但无足轻重的人，小人物
a member of a large organization whose job, although necessary, makes them feel as if they are not important
I decided to set up my own business because I was tired of just being a cog in a machine. 我决定创立自己的公司，因为我厌倦了在大公司中做个微不足道的小人物。