underpin ( synonym found)

Definition of underpin:

°To support from below with props or masonry.
"You should underpin the mine roof to prevent further collapse."
°To give support to; to corroborate.
"Public confidence in politicians must underpin our democracy."

Definition of underpin:

°To support from below with props or masonry.
"You should underpin the mine roof to prevent further collapse."
°To give support to; to corroborate.
"Public confidence in politicians must underpin our democracy."

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