Meaning of the word "a cog in the machine" in English

What does "a cog in the machine" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a cog in the machine

US /ə kɑɡ ɪn ðə məˈʃiːn/
UK /ə kɒɡ ɪn ðə məˈʃiːn/

Idiom

a person who plays a small but necessary part in a large organization or system

Example:
He felt like just a cog in the machine at his new corporate job.
Even a cog in the machine can make a difference if it stops working.