underside

From under- +‎ side

• (US) IPA^(key): /ˈʌndɚsaɪd/

underside (plural undersides)

1. The side that is below or underneath, the bottom.
   • 2016 January 23, Michael Emons, “Crystal Palace 1–3 Tottenham”, in (Please provide the book title or journal name)‎, BBC Sport:

     The Eagles then hit the woodwork twice in a matter of seconds as Scott Dann headed Jason Puncheon's free-kick against the underside of the bar, before substitute Mile Jedinak also hit the crossbar with a shot on the turn.

• overside

• undesired

From under- +‎ side

underside f or m (definite singular undersida or undersiden, indefinite plural undersider, definite plural undersidene)

1. underside

• overside

• “underside” in The Bokmål Dictionary.

From under- +‎ side

underside f (definite singular undersida, indefinite plural undersider, definite plural undersidene)

1. underside

• overside

• “underside” in The Nynorsk Dictionary.