Dictionary

underbelly

noun un·der·bel·ly \ˈən-dər-ˌbe-lē\

: the bottom part of an object or an animal's body

: an area that is easy to attack or criticize

: a part of society, an organization, etc., that is hidden and usually unpleasant

Full Definition of UNDERBELLY

1
:  a vulnerable area; also :  a corrupt or sordid part <probing the underbelly of the entertainment industry>
2
:  the underside of a body or mass
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First Known Use of UNDERBELLY

1942

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