Also, I beg your pardon, pardon me. Forgive me, as in Excuse me, please let me pass, or Pardon me for asking, or I beg your pardon, I don't think so. These phrases are used as an apology for interrupting a conversation, bumping into someone, asking a speaker to repeat something, politely disagreeing with something said, and so on. The first dates from about 1600, the first variant from about 1800, the second from the mid-1700s.
Also, excuse oneself. Allow or ask to leave or be released from an obligation. For example, Please excuse me, I have to leave now, or I asked the judge to excuse me from jury duty. [1920s]