The act or process by which something is undermined.(noun)
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Use "undermining" in a sentence
"All this talk about the wonderfullness of payroll taxes is just the first step in undermining Social Security."
"The executives of Wal-Mart who have been instrumental in undermining our economy by being instrumental in sending millions of much-needed US jobs to China?"
"They talk about the Constitution, but they are interested in undermining the constitutional principle of church-state separation that protects the rights of all people of faith, especially religious minorities."