underside

/ˈʌndərˌsaɪd/
noun
  1. The bottom or lower surface of something.
    • He checked the underside of the car for rust.
    • The underside of the leaf was covered in tiny insects.
    • She found a key taped to the underside of the desk.
  2. The less visible or less pleasant aspect of something.
    • The documentary explored the underside of the fashion industry.
    • The book reveals the underside of political power.
    • There is a dark underside to the city's glittering nightlife.
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