at the expense of
US /æt ðə ɪkˈspens ʌv/
UK /æt ðə ɪkˈspens ʌv/

1.
~을 희생하여, ~의 대가로
resulting in harm or damage to (someone or something else)
:
•
He pursued his career at the expense of his family life.
그는 가족 생활을 희생하면서 경력을 추구했다.
•
The company increased profits at the expense of environmental regulations.
회사는 환경 규제를 희생하면서 이익을 늘렸다.