Etymology
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undergird (v.)

1520s, from under + gird (v.). Related: Undergirded; undergirding.

updated on June 22, 2012

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Definitions of undergird from WordNet

undergird (v.)
lend moral support to;
undergird (v.)
make secure underneath;
undergird the ship
Synonyms: brace up
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.