noun, noun or participle which takes 'suru'
backstab; betrayal
Refers to a treacherous act, especially betraying someone who trusts you. Often used figuratively in social or workplace contexts.
彼の行動は完全なバックスタッブだった。
His action was a complete backstab.
同僚にバックスタッブされて、プロジェクトから外
I was backstabbed by a colleague and removed from the project.