transitive verb-·gird′ed or -·girt′, -·gird′ing
- to gird, strengthen, or brace from the bottom side
- to supply support or a strong basis for
transitive verbun·der·gird·ed, or un·der·girt un·der·gird·ing, un·der·girds
To support or strengthen from beneath.
(third-person singular simple present undergirds, present participle undergirding, simple past and past participle undergirded)
From under- +"Ž gird.