Owe it to implies that someone owes something to someone or something. Synonyms for owe it to include being indebted to, owing a debt to, owing something to, having an obligation to, being responsible for, and being accountable to. Other synonyms could include being duty-bound to, having a responsibility to, owing a favor to, needing to repay, and being beholden to. In other words, when someone says they owe it to someone or something, they are acknowledging that they have a duty or responsibility to fulfill the needs or expectations of that person or thing. Using these synonyms can help to express similar sentiments in a more varied and nuanced manner.