vitiate
[ˈvɪʃiˌet]
vt.& vi.
（使）削弱;
（使）破坏;
（使）损害;
（使）无效;
n.
破坏，损害;
破坏者;
例句:
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But this does not vitiate his scholarship.
但这不会威胁到他的奖学金。
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This may vitiate a literal translation.
这就会损害直译的价值。
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No such Variation shall vitiate or invalidate this Contract.
任何该等变更都不会影响本合同或造成本合同失效.