un·der·gird /ˌʌndɚ/
  Un·der·gird v. t. To bind below; to gird round the bottom.
     They used helps, undergirding the ship.   --Acts xxvii. 17.
  ◄ ►
  undergird
       v 1: lend moral support to
       2: make secure underneath; "undergird the ship" [syn: brace up]
       [also: undergirt]