Underside

Pronunciation: /ˈʌndərˌsaɪd/

Underside (noun)

  1. The surface on the bottom of something, especially the part you cannot see when it is standing upright.
  2. The lower side of an object or area, often the part that is less visible or protected from view.

Examples

  • The underside of the table is smooth.
  • Check the underside before you place the box down.