Meaning of the word backstabber in English

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

backstabber

US /ˈbækˌstæb.ɚ/
UK /ˈbækˌstæb.ər/

Noun

a person who harms someone secretly and unfairly, especially someone who was thought to be a friend

Example:
I can't believe she turned out to be such a backstabber.
He was known as a backstabber in the office, always spreading rumors.