To underpin something is to support it with something else. When you underpin a building, you are providing the foundation for it.
The foundation was underpinned with concrete to make sure it would last.
The company is underpinning its new policy with research.
verb
support with evidence or authority or make more certain or confirm
Synonyms:
verb
support from beneath
1
That would underpin the article improvement ideal at the start.
2
Lawsuit alleges that stolen ideas underpin Pinterest.
3
Rational pricing underpins the logic of swap valuation.
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That would underpin the article improvement ideal at the start.
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The prime purpose was to underpin influence and to what extent.
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The two articles that underpin the lead are also dubious.
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This seems to underpin the discussions below about the sources.
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Nothing here in the way of reliable sources to underpin notability.
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The real problem is a lack of sources to underpin a claim of notability.
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Two policies were formulated that underpin the organization to the present.