underpinned

/AH1 N D ER0 P IH0 N D/
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€

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