undergird

verb

1. To strengthen, secure, or reinforce by passing a rope, cable, or chain around the underside of an object.
2. (figuratively)To give fundamental support; provide with a sound or secure basis; provide supportive evidence for.

   “For fiction, documentary, verse, and essay, she undergirds entertaining images and stories with profound themes of ecological responsibility and challenge to the suppression of human rights.”

   ““I’m not being cynical about Tim Scott individually. I am maybe suggesting that the rhetoric of ‘can’t we all get along?’ – and those quotes you made about, you know, from my speech in 2004 about there’s a ‘United States of America’ – that has to be undergirded with an honest accounting of our past and our present,” Obama told Axelrod, his former senior adviser, adding that he hadn’t listened the South Carolina Republican’s 2024 campaign speeches.”

3. To lend moral support to.
4. To secure below or underneath.