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  1. un·der·pin·ning
    IPA[ˈəndərˌpiniNG]
  2. noun

    • 1. a solid foundation laid below ground level to support or strengthen a building.

    • 2. a set of ideas, motives, or devices that justify or form the basis for something:

      the theoretical underpinning for free-market economics
  3. Variation

    • n.: noun: underpinning, plural noun: underpinnings

    • noun

      a solid foundation laid below ground level to support or strengthen a building.

      a set of ideas, motives, or devices which justify or form the basis for something:

    • verb

      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:

    • verb

      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:

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