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 January 31, Abigail Van Buren, “Dear Abby: You Can't Reform Dad”, in Columbia Missourian, page 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.