What idioms are there to describe debt?

Have a guilty conscience [wèn xρn yǒu kuǒ]: Ask yourself; Shame: shame. Ask yourself, uneasy. Do wrong to others.

Facing the families of the victims, he felt guilty and dared not face them squarely.

Regret it? [huǐ bù dāng chū]: I regret that I didn't take action at the beginning.

If I knew how difficult writing was, I would regret learning to refine silver.

Regret? [huǐ hèn jiāo jiā]: hate: regret; Cross: appear together. Describe very regret.

Ex.: When I think about the whole process of being cheated, I really regret it and have no place to live.

Confess together? [huǐ zhī wú jí]: It's too late to express regret now.

Ex: I hate leaving this country before I leave, and I can't escape the notoriety of the world. Regret is common.

Regret [hê u hu ǐ bü dié]: It's too late to regret.

Example: I felt embarrassed when I said it and regretted it for a while.