Third-person singular simple present indicative form of undermine.(verb)
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Use "undermines" in a sentence
"NCAI President Jefferson Keel said at the time that the use of a Native American term "undermines the military service of Native people.""
"She continues, “If the pro-choice stance is so precarious that a story about someone who chose to carry a risky pregnancy to term undermines it, then CBS is not the problem.”"
"How about “McCain undermines national security by playing Model UN and sending pretend ambassadors to Georgia”?"