Idiom of the day :- Run up an account
Usage, examples and definition of the Idiom :-
Instead of paying cash each time he shops, Mr. Long finds it more convenient to run up an account at the stores where he makes his purchases. To run up an account is to increase the money you owe. You can also run up a bill or a debt, which means the same as run up an account. Mr. Long does this ( very easily, I might add!) by using credit cards.