Backstabbing (noun)

1. An act of treachery or betrayal, especially in a political or business context.
2. A devious and underhanded action, often done with the intention of hurting or undermining someone else.

Origin:

From 'back' and 'stab' meaning 'an act of treachery or betrayal'.

Examples:

1. The employee was fired for his backstabbing behavior, spreading rumors and lying about his coworkers.
2. The backstabbing politician was known for his lack of integrity, constantly changing his stance on issues to suit his needs.
3. The CEO was shocked by the backstabbing of his former business partner, who had stolen sensitive information and leaked it to the competition.
4. The backstabbing behavior of the team members was unacceptable, and the team leader had to take action to stop it.
5. The backstabbing actions of the rival company contributed to the downfall of the small business.