regret something
make an excuse
apologize for something
forgive somebody for something
blame somebody for something
explain something
to say/think that a particular person is responsible for something bad or wrong that happened.
to give a reason to explain why you did something wrong.
to stop being angry with someone for something they have done.
to feel sorry or disappointed about something that you wish could be different.
to say that you are sorry for doing something.
to make something clearer and easier to understand by giving more details about it.