underpinning

/AH1 N D ER0 P IH0 N IH0 NG/
verb
  1. 1

    To support from below with props or masonry.

    โ€œYou should underpin the mine roof to prevent further collapse.โ€

  2. 2

    To give support to; to corroborate.

    โ€œPublic confidence in politicians must underpin our democracy.โ€

noun
  1. 1

    A support or foundation, especially as a structure of masonry that supports a wall.

    โ€œThis house's underpinning is not up to standard.โ€

  2. 2

    A basis for something.

    โ€œI would like to know more about the underpinning of this political theory.โ€

  3. 3

    The lower body or legs.

Source: https://en.wiktionary.org/wiki/underpin, https://en.wiktionary.org/wiki/underpinning