committed or obligated to repay a monetary loan: He was indebted to his friend for a large sum.
2.
obligated for favors or kindness received: He was indebted to her for nursing him through pneumonia.
Origin: 1175–1225; in-2 + debt + -ed2; replacing Middle English endetted < Old French endetté, past participle of endetter to involve in debt (see en-1)
late 14c., "owing money," from O.Fr. endette, pp. of endetter "to involve in debt," from en- "in" + dette "debt" (see debt). Fig. sense of "under obligation for favors or services" first attested 1560s.