make (an argument, statement, or theory) unsound or erroneous
(对论点、声明或理论)驳斥,证明是谬误的。
deprive (an official document or procedure) of legal efficacy because of contravention of a regulation or law
使(公文或手续)无法律效力
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a technical flaw in her papers invalidated her nomination .证件中的一个技术性错误导致她的提名无效。
"mid 17th cent.: from medieval Latin