at (one's) expense

(redirected from at their expense)

at (one's) expense

1. One's financial responsibility. Once I learned that the trip was at my expense, I decided not to go.
2. To one's detriment or disadvantage. I was furious when I heard the other kids telling jokes at my little brother's expense.
See also: expense

at (one's) expense

To one's detriment or chagrin: telling jokes at my expense.
See also: expense