FORGIVE›to forgive someone for something that is not very serious: Please excuse my appearance, I've been painting.[+ for+ doing sth]She asked him to excuse her for being so rude.
NOT DO›to say that someone does not have to do something that they usually have to do: Could I be excused from football training today?
EXPLAIN›to be given as a reason for someone's bad behaviour, so that it does not seem so bad: Nothing can excuse what he did.
excuse me›used to politely get someone's attention: Excuse me, does this bus go to Oxford Street?›used to say sorry for something that you do without intending to: Oh, excuse me, did I take your seat?