undergirded; undergirding; undergirds
Definition of undergird
1 archaic : to make secure underneath took measures to undergird the ship — Acts 27:17 (Revised Standard Version)
2 : to form the basis or foundation of : strengthen, support facts and statistics subtly undergird his commentary— Susan Q. Stranahan
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Time Traveler for undergird
The first known use of undergird was in 1526
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