noun
- a person who betrays or harms someone who trusts them, especially by acting friendly while secretly working against them
Usage: informal
Examples
- I thought he was my friend, but he turned out to be a backstabber who told my secrets to everyone.
- She’s such a backstabber – she acts nice to your face but talks badly about you behind your back.
- Don’t trust him with confidential information; he’s known to be a backstabber.
- The office backstabber spread rumors to get ahead in the company.
- After years of friendship, I discovered she was a backstabber who had been undermining me.
- He earned a reputation as a backstabber after betraying his business partner.