fat lip

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fat lip (plural fat lips)

  1. (idiomatic) A swelling on the lip, especially one resulting from a punch or other blow.
    • 1966 31 Jan., Abigail Van Buren, "Dear Abby: You Can't Reform Dad," Columbia Missourian, p. 9:
      He has a very ugly temper, and I have to be careful what I say to him or I'll end up with a fat lip.