Underpinning Definition

ŭndər-pĭnĭng
underpinnings
noun
A supporting structure or foundation, esp. one placed beneath a wall.
Webster's New World
Anything that serves as a support or basis.
The flimsy underpinnings of their argument.
Webster's New World
A support or foundation.
American Heritage
The legs.
Webster's New World

Other Word Forms of Underpinning

Noun

Singular:
underpinning
Plural:
underpinnings

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underpinning