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

1.
atas biaya seseorang, dengan mengorbankan seseorang
paid for by someone; causing loss or damage to someone
:
•
The company party was held at the company's expense.
Pesta perusahaan diadakan atas biaya perusahaan.
•
He made a joke at her expense, which made her feel uncomfortable.
Dia membuat lelucon dengan mengorbankan dirinya, yang membuatnya merasa tidak nyaman.