underpin - definition and synonyms

verb [transitive] 

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present tense
present participleunderpinning
past tenseunderpinned
past participleunderpinned
  1. 1
    to be an important basic part of something, allowing it to succeed or continue to exist

    the assumptions and beliefs that underpin our whole lives

  2. 2
    to support something such as a wall by putting a strong piece of metal or concrete under it