"Available credit" refers to the amount of money you can still borrow or spend from your credit line. It represents the unused portion or balance that you have on your credit card or any other form of credit. Full definition
It shows how much of available credit limit is in use. (effectify.com)
If you have a balance of over 35 percent or more of total available credit limit on individual cards, this can hurt your credit, even if you make your regular payments. (secureloanconsolidation.com)
As an example, imagine you have two credit cards, each with a $ 500 credit limit, for total available credit of $ 1,000. (creditcards.com)