The underbelly of a person or organization is the part of them that they try to keep hidden. The underbelly of a politician is usually their shady past, the underbelly of a business is their shady practices, and the underbelly of a community is their shady dealings.
noun
the soft belly or underside of an animal's body
Synonyms:
noun
lower side
noun
the quality of being weak or unprotected
1
Every community has its less seemly underbelly, as we know.
2
A white underbelly is permissible but a coloured underbelly is encouraged.
3
It's the unpleasant underbelly of Wikipedia.
4
It's the unpleasant underbelly ofWikipedia.
5
The ugly underbelly if you will.
6
The underbelly is black and green.
7
Welcome to the sleazy underbelly of Wikipedia
8
Sharpedo is colored blue with a white underbelly.
9
Most vulnerable part of the train is the underbelly.
10
It was general ashy grey with a white underbelly.