un‧der‧bel‧ly /ˈʌndəˌbeli $ -ər-/ noun [singular] literary

1. the unpleasant parts of a place or society that are normally hidden
underbelly of
photographs that capture the underbelly of the United States – its poverty, its injustice, and its alienated underclass

2. the weakest part of an organization or a person’s character, that is most easily attacked or criticized
underbelly of
They needed to find the soft underbelly of their opponents.

3. the lower part of an animal’s body, including the stomach

[TahlilGaran] Dictionary of Contemporary English ▲