IPA: /ˈsʌm.bə.di/
KK: /ˈsʌmbəˌdi/
A person who is important or has a significant role in a situation.
She is somebody who always helps others in need.
An unspecified or unknown person; someone.
I saw somebody walking their dog in the park.
Somebody → The word is formed from "some" (from Old English "sum", meaning a certain amount or unspecified) and "body" (from Old English "bodig", meaning the physical structure of a person or animal). The term "somebody" refers to an unspecified person or individual.
Think of 'some' as referring to an unspecified amount and 'body' as the physical form of a person. This helps you remember that 'somebody' means an unspecified person.