Often used metaphorically to discuss hidden or negative aspects of something that seem better on the surface. Many films explore the underbelly of urban life.
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Negative Connotation
'Underbelly' typically has a negative connotation, implying something unsavory or undesirable. The report uncovered the underbelly of the political system.
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Public vs Private
Refers to what is not immediately visible or presented to the public, usually hidden intentionally. Celebrities often have a hidden underbelly that fans don't see.