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Synonyms
un·der·pin·ning (ŭńdər-pĭńĭng)

noun 

  1. Material or masonry used to support a structure, such as a wall.
  2. A support or foundation. Often used in the plural.
  3. Informal The human legs. Often used in the plural.
un·der·pin (ŭńdər-pĭń)

transitive verb: -pinned, -pin·ning, -pins. 

  1. To support from below, as with props, girders, or masonry.
  2. To give support or substance to: “the public awareness that must underpin a sustained and concerted development effort for Africa and its youth” (Barber B. Conable)