underbelly
noun /ˈʌndəbeli/
/ˈʌndərbeli/
[singular]- the soft part of an animal on the underside of its bodyTopics Animalsc2
- the weakest part of something that is most easily attacked
- The trade deficit remains the soft underbelly of the US economy.
- an unpleasant or criminal part of society that is usually hidden
- He became familiar with the dark underbelly of life in the city.