un·der·bel·ly 
/ˈʌndɚˌbɛli/ noun
plural un·der·bel·lies /ˈʌndɚˌbɛli/ noun 1 [count] : the bottom part of an object or an animal's body — usually singular ▪ the underbelly of an airplane ▪ a whale's underbelly 2 [singular] : an area that is easy to attack or criticize
▪ the army's underbelly ▪ They exposed the underbelly of the nation's economic policy. 3 [singular] : a part of society, an organization, etc., that is hidden and usually unpleasant
▪ the sordid underbelly of city life ▪ the industry's dark underbelly
▪ the army's underbelly ▪ They exposed the underbelly of the nation's economic policy.
▪ the sordid underbelly of city life ▪ the industry's dark underbelly
