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un‧der‧pin
past tense and past participle underpinned, present participle underpinning [transitive]
past tense and past participle underpinned, present participle underpinning [transitive]1 to give strength or support to something and to help it succeed : the theories that underpin his teaching method America's wealth is underpinned by a global system which exploits the world's poor.
the theories that underpin his teaching methodAmerica's wealth is underpinned by a global system which exploits the world's poor.2 technical to put a solid piece of metal under a wall or house in order to make it stronger
—underpinning noun [uncountable and countable]
