Underpin
Pronunciation : Un`der*pin"
Part of Speech : v.
Definition : 1. To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest.
2. To support by some solid foundation; to place something underneath for support.
t. [imp. & p. p. Underpinned; p. pr. & vb. n. Underpinning.]
Source : Webster's Unabridged Dictionary, 1913