be in somebody's debt

be in (one's) debt

1. Literally, to owe one money. That's what loan sharks do—they get you to be in their debt and then squeeze you dry.
2. To owe one gratitude (or, more rarely, some form of compensation, such as a favor) for their help. Helen's the one who got me a job at that great company, so I'm forever in her debt.
See also: debt

be in somebody’s ˈdebt

(formal) be very grateful to somebody because they have helped you: After my divorce Ann was the only one prepared to listen to my problems, and I am forever in her debt.
See also: debt