"underbellies" in the noun sense
1. underbelly
lower side
"the underbellies of clouds"
2. underbelly, underbody
the soft belly or underside of an animal's body
3. underbelly
the quality of being weak or unprotected
"the soft underbelly of the Axis"- Winston Churchill
Source: WordNet® (An amazing lexical database of English)
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