at someone's expense
US /æt ˈsʌm.wʌnz ɪkˈspɛns/
UK /æt ˈsʌm.wʌnz ɪkˈspɛns/

1.
على نفقة شخص, على حساب شخص
paid for by someone; causing loss or damage to someone
:
•
The company party was held at the company's expense.
أقيم حفل الشركة على نفقة الشركة.
•
He made a joke at her expense, which made her feel uncomfortable.
لقد ألقى نكتة على حسابها، مما جعلها تشعر بعدم الارتياح.