Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb undergird

2 senses of undergird

Sense 1
undergird -- (lend moral support to)
       => support, back up -- (give moral or psychological support, aid, or courage to; "She supported him during the illness"; "Her children always backed her up")

Sense 2
undergird, brace up -- (make secure underneath; "undergird the ship")
       => strengthen, beef up, fortify -- (make strong or stronger; "This exercise will strengthen your upper body"; "strengthen the relations between the two countries")