v.
Pronunciation: ˌ ə n-d ə r- ' g ə rd
Function: transitive verb
Date: 1526
1 archaic : to make secure underneath <took measures to undergird the ship ― Acts 27:17(RSV)>
2 : to form the basis or foundation of : STRENGTHEN , SUPPORT <facts and statistics subtly undergird his commentary ― Susan Q. Stranahan>