at one's expense
01
used to say who has paid for something
Idiom
例子
The document was printed at the taxpayer's expense.
The tour is free, but all meals are at your own expense.
02
(particularly of a joke) in a way that causes harm to someone or makes them embarrassed
DisapprovingIdiom例子
He told a joke at her expense, which left her feeling humiliated in front of the entire group.
Making fun of his appearance during the presentation was completely uncalled for and hurtful — it was humor at his expense.
