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underpinning

 
 
/ˈʌndəˌpɪnɪŋ/ noun [C or U]

Definition

something that provides support for something, or that is the starting point from which something can develop: A strong opening on Wall Street provided a firm underpinning for the FTSE 100.
(Definition of underpinning noun from the Cambridge Business English Dictionary © Cambridge University Press)

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