screwing someone behind one's back

اصطلاحی است که معمولاً به خیانت یا فریب کسی بدون اطلاع یا رضایت او اشاره دارد. این به معنای درگیر شدن در رفتار غیرصادقانه یا خیانتکارانه است که برخلاف اعتماد و انتظارات فرد فریب خورده است.
John thought he could trust his business partner, but little did he know that his partner was screwing him behind his back by secretly diverting company funds
Lisa was devastated to discover that her best friend had been screwing her behind her back by spreading false rumors about her
The politician promised to support the community, but he was actually screwing them behind their backs by making deals that benefited his own interests
Sarah's boyfriend was cheating on her for months, effectively screwing her behind her back and damaging their relationship
The employee was fired for screwing his colleagues behind their backs by stealing their ideas and presenting them as his own