1
as in basis
an immaterial thing upon which something else rests
the underpinnings of the theory have recently been called into question
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2
as in support
a structure that holds up or serves as a foundation for something else
the underpinnings of the bridge were seriously damaged in the collision
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as in sustaining
to hold up or serve as a foundation for
the central beliefs that underpin a free society
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Merriam-Webster unabridged
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