Definify.com
Webster 1913 Edition
Underpin
Unˊder-pin′
,Verb.
T.
[
imp. & p. p.
Underpinned
; p. pr. & vb. n.
Underpinning
.] 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.
Webster 1828 Edition
Underpin
UNDERPIN'
, v.t.1.
To lay stones under the sills of a building, on which it is to rest.2.
To support by some solid foundation; or to place something underneath for support.