Definitions for underpinˌʌn dərˈpɪn
Random House Webster's College Dictionary
un•der•pinˌʌn dərˈpɪn(v.t.)-pinned, -pin•ning.
to prop up or support from below; strengthen.
to replace or strengthen the foundation of.
to substantiate or corroborate.
Origin of underpin:
support from beneath
corroborate, underpin, bear out, support(verb)
support with evidence or authority or make more certain or confirm
"The stories and claims were born out by the evidence"
To support from below with props or masonry.
You should underpin the mine roof to prevent further collapse.
To give support to; to corroborate.
Public confidence in politicians must underpin our democracy.
to lay stones, masonry, etc., under, as the sills of a building, on which it is to rest
to support by some solid foundation; to place something underneath for support