Question : What does “rack up” mean here?
I wonder what does “racks up” mean in the following sentence:

“”I can show you a client of mine right now who lives in a suburb of Chicago, he’s a doctor, makes $ 350,000 a year, and he routinely racks up $ 25,000 on his credit cards,” says Michael Kalscheur, a financial planner at Castle Wealth Advisors in Indianapolis. ”

If anyone can explain it for me? Many thanks!
financial planner indianapolis

Best answer:

Answer by Erica
It means to accumulate :)