barge in
barge in {v. phr.}, {informal}
To appear uninvited at someone's house or apartment, or to interrupt a conversation.
I'm sorry for barging in like that, Sir, but my car died on me and there is no pay phone anywhere.
I'm sorry for barging in while you two are having a discussion, but could you please tell me where the nearest exit is?
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Source: A Dictionary of American Idioms