> un·der·pin
ˌəndərˈpin/
verb
verb: underpin; 3rd person present: underpins; past tense: underpinned; past participle: underpinned; gerund or present participle: underpinning
support (a building or other structure) from below by laying a solid foundation below ground level or by substituting stronger for weaker materials.
support, justify, or form the basis for.