If you forgive someone, you stop blaming him. You should really forgive your kid sister for eating the rest of the cake.
Forgive comes from the Old English forgiefan, which also means "forgive," just with cooler spelling. When you forgive someone or something, that's the end of the story. Eventually, you will have to either forgive your friend for stealing your boyfriend, or stop being her friend. Loans can also be forgiven. If your credit card company forgives your debt, that means you no longer have to pay it.