When you continuously overspend and end up with a large debt, it is commonly referred to as running up bills. However, there are many ways to describe this financial situation using different phrases or words. Some synonyms for run up bills include to incur debt, accumulate charges, amass expenses, accumulate bills, build up liabilities, accrue obligations, and collect liabilities. It's important to be aware of these different descriptions to accurately communicate your financial situation and avoid negative consequences, such as damage to your credit score or difficulty managing your debts. Remember to prioritize responsible spending habits to avoid running up bills in the first place.