underbelly
Pronunciation:
/ˈʌndəbɛli//ˈʌndɚbɛli/noun
Definitions
The underside of an animal.
Example: We identified the species of the snake by its blue-grey underbelly.
The underside of any thing.
The side which is not normally seen, normally a dark, immoral place.
Example: The area by the canal is the underbelly of town – not something you’d see in the guidebooks.