American English

Definition of underbelly noun from the Oxford Advanced American Dictionary

     

    underbelly

     noun
    noun
    NAmE//ˈʌndərˌbɛli//
     
    [singular]
     
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  1. 1the weakest part of something that is most easily attacked The trade deficit remains the soft underbelly of the U.S. economy.
  2. 2the underneath part of an animal (figurative) He became familiar with the dark underbelly of life in the city (= the parts that are usually hidden).
See the Oxford Advanced Learner's Dictionary entry: underbelly