underbelly - definition and synonyms

noun [countable] 

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/ˈʌndə(r)ˌbeli/
singularunderbelly
pluralunderbellies
  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
    3
    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