If you repay a loan or a debt, you pay back the money that you owe to the person who you borrowed or took it from. He advanced funds of his own to his company, which was unable to repay him
If you repay a favour that someone did for you, you do something for them in return. It was very kind. I don't know how I can ever repay you
To make return or requital for; to recompense; in a good or bad sense; as, to repay kindness; to repay an injury