undergird

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Definitions from WordNet

Verb undergird has 2 senses

undergird - lend moral support to
--₁ is one way to support, back up
Sample sentence:
Something ----s somebody
undergird, brace up - make secure underneath; "undergird the ship"
--₂ is one way to strengthen, beef up, fortify
Sample sentence:
Something ----s something

Definitions from the Web

Undergird

Definition:

Undergird is a verb that means to provide support or strength to something, especially to reinforce from below.

Sense 1: Support or Strengthen

Example sentence: The steel beams undergird the bridge, ensuring its stability and safety.

Sense 2: Reinforce from Below

Example sentence: The strong foundation undergirds the entire structure, preventing any potential collapse.