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Verb: butt in
  1. Break into a conversation
    "her husband always butts in, even when he is not involved in the conversation";
    - chime in [informal], cut in, put in, barge in [informal], break in, chip in [informal]

Derived forms: butting in, butts in, butted in

See also: thrust ahead

Type of: break up, cut off, disrupt, interrupt