Undergird v. t. : To blind below; to gird round the bottom.

Example:
In what sense can religions be understood to Undergird public morality?

Taxonomy
Merriam-Webster Online Dictionary, Dictionary, webster, Word Games, Webster Online Dictionary with audio pronunciations, thesaurus, Google Search, Custom Search, glossary, english, language, ESL, Search, gird, n-d, transitive verb, measures, Acts.

Defination from the web:
undergird from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... 1 archaic : to make secure underneath <took measures to undergird the ship — Acts 27:17(Revised Standard Version) ...