much obliged
1. Indebted to someone for their generosity, kindness, or favor. We are much obliged for all you have done on behalf of our father.
2. Thank you very much. A: "Here's your jacket, sir." B: "Much obliged, son."
Much obliged.
Rur. Thankful and owing a debt of gratitude. A: Sit down, Elmer, and have a drink on me. B: Much obliged.