debtor
A person who owes money to someone else.
A debtor is someone who owes money to another person or organization. If you borrow five dollars from a friend to buy lunch, you become a debtor until you pay that money back. Your friend becomes your creditor, the person you owe.
The word appears often in financial contexts. When someone takes out a loan to buy a house, they're a debtor to the bank. If a business borrows money to expand, it becomes a debtor to its lenders. Countries can be debtors too, owing money to other nations or international organizations.
Being a debtor isn't inherently bad. Most people become debtors at some point, whether borrowing for college, a car, or a home. What matters is being a responsible debtor: someone who keeps track of what they owe and pays it back as promised. Someone who borrows money and refuses to repay it, or ignores their debts, damages their reputation and makes it harder to borrow in the future.
Throughout history, societies have handled debtors differently. Some ancient cultures had debtors' prisons, where people who couldn't pay were locked up (which made it even harder for them to earn money to repay!). Modern laws are generally more forgiving, recognizing that sometimes people face circumstances beyond their control that make repayment difficult.