Definition of underpin
- underpin a structure
- underpin a sagging building
a wall underpinned by metal beams
the central beliefs that underpin a free society
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'underpin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
: to strengthen or support (something) from below
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of yeast or being unsettled or frivolous
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