Noun
The underside of an animal.
We identified the species of the snake by its blue-grey underbelly.
The underside of any thing.
(figuratively) The side which is not normally seen, normally a dark, immoral place.
The area by the canal is the underbelly of town – not something you’d see in the guidebooks.
By contrast, 1975's Coney Island Baby was mainly a warm and mellow album, though for its characters Reed still drew on the underbelly of city life. Source: Internet
Lynch and Rodley 2005. p. 110. Another theme is the dark underbelly of violent criminal activity within a society, such as with Frank's gang in Blue Velvet and the cocaine smugglers in Twin Peaks. Source: Internet
Mistle Thrush - which a have black-spotted cream underbelly - are on the list of endangered British birds, with the number of mating pairs plummeting in recent years due to habitat destruction. Source: Internet
It is blotchy brown or red-brown in color, with a paler underbelly. Source: Internet
Let me just do that right now for all you listening out there because I have been dumbfounded by it as well, but the explanation is pretty clear if you know what’s happening on the underbelly of how these campaigns are run. Source: Internet
These fish are iridescent blue-green above with a silvery underbelly and twenty to thirty near vertical wavy black stripes running across their upper body. Source: Internet