expense /ɪkˈspɛns/noun 3verb 1forms 3phrases 1 noun3 •a cost that someone has to pay in order to live, travel or run a businessShe went to great expense to ensure her children would get the best education.Buying the car was a big expense, but will be worth it in the long run. •The elimination or consumption of something, sometimes with the notion of loss or damage to the thing eliminated.Jones reached the final at the expense of Smith, who couldn't beat him. •(no longer used) Loss.And moan the expense of many a vanished sight. — 1609 verb1 •To charge a cost against an expense account; to bill something to the company for which one works.It should be acceptable to expense a business lunch with a client. formsexpensed · expensing · expenses Phrases with expense at the expense ofPaid for by an individual or group.