undergird

(un′dər gʉrd)

transitive verb undergirded or undergirt, undergirding

  1. to gird, strengthen, or brace from the bottom side
  2. to supply support or a strong basis for

See undergird in American Heritage Dictionary 4

transitive verb un·der·gird·ed or un·der·girt (-gûrtˈ), un·der·gird·ing, un·der·girds
To support or strengthen from beneath.

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