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Learner's definition of EXPENSE  
[noncount]  : the amount of money that is needed to pay for or buy something
◊ If you spare no expense, you spend as much money as you need to in order to make something as good as possible.
— often used after at
— see also at someone's expense (below)
[count]  : an amount of money that must be spent especially regularly to pay for something — usually plural
[count]  : something on which money is spent

at someone's expense

: paid for by someone
◊ If someone makes a joke about you or laughs at you, the joke or laughter is said to be at your expense.

at the expense of

: in a way that harms (something or someone)

go to (the) expense

: to spend money on something
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