Underside and Volte-face

Underside noun - The side or part facing downward from something.

Volte-face and underside are semantically related In some cases you can use "Volte-face" instead a noun "Underside".

Volte-face noun - A changing from one policy or point of view to virtually its exact opposite.

Underside and volte-face are semantically related in opposite topic. Sometimes you can use "Underside" instead a noun phrase "Volte-face".