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English definition of “underbelly”

underbelly

noun [S]     /ˈʌn.dəˌbel.i/ US  /-dɚ-/ literary
the weakest or most unpleasant part of something that is most likely to fail or be easily defeated: a film exposing the sordid underbelly of modern urban society Small businesses are the soft underbelly (= weakest parts) of the British economy, and they need as much government support as possible.Weakness and vulnerability
(Definition of underbelly noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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