underbelly - definition and synonyms

noun [countable] 

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  1. 1
    the part under an animal’s body where the stomach is

    the white underbelly of a fish

  2. 2
    the bottom surface of a plane or other vehicle
  3.   From our crowdsourced Open Dictionary
    the dark underbelly of something negative or unpleasant aspects of something which are not widely known or discussed

    The article takes a harsh look at the dark underbelly of professional sports.

    Submitted by Boris Marchenko from Russian Federation on 17/03/2016