Definition of underpinning noun from the Oxford Advanced Learner's Dictionary

     

    underpinning

     noun
    noun
    BrE BrE//ˌʌndəˈpɪnɪŋ//
     
    ; NAmE NAmE//ˌʌndərˈpɪnɪŋ//
     
    [countable, uncountable]
     
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  1. 1(formal) something that supports or forms the basis of an argument, a claim, etc. the theoretical underpinnings of the study
  2. 2(specialist) the act of supporting a wall by putting metal, concrete, etc. under it; the metal, concrete, etc. that supports the wall The only way to save the building is through extensive underpinning.

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