- expense
- /Ik'spens/ noun (C, U)
1 the amount of money that you have to spend on something: household/medical/living etc expenses (=the money that you spend for a particular purpose): The students share all the household expenses. | go to great expense also go to a lot of expense (=spend a lot of money on something): We went to a lot of expense to provide the safety equipment so please take care of it. | spare no expense (=spend as much money as is necessary to get the best or most expensive things): Julie's parents had spared no expense for her wedding. | at great/little/no expense: We were wined and dined at great expense. | think of the expense (=it's too expensive): I'd love to go to the Caribbean but think of the expense!2 expenses (plural) money that you spend while you are doing your job on things such as travel and food, and which your employer then pays to you: be on expenses (=if the cost of something is on expenses, the person that you work for pays for it rather than you): Come on, have another drink. It's all on expenses, you know. | all expenses paid (=something, especially a holiday or journey that is all paid for by someone else): The prize is an all expenses paid trip to Rio.3 at sb's expensea) if you do something at someone's expense, they pay for you to do it: Bill's just been on a computing course, all at the company's expense.b) if you make jokes at someone's expense, you laugh about them: Louis kept making jokes at his wife's expense.4 at the expense of if something is done at the expense of something else, it is only achieved by harming the other thing: High production rates are often achieved at the expense of quality of work.
Longman dictionary of contemporary English. 2004.