Etymology
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underpin (v.)

"support or prop," 1520s (figurative); 1530s (literal), from under + pin (v.). Related: Underpinned; underpinning.

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Definitions of underpin

underpin (v.)
support from beneath;
underpin (v.)
support with evidence or authority or make more certain or confirm;
Synonyms: corroborate / bear out / support
From wordnet.princeton.edu