vitiate

verb

/ˈvɪʃieɪt/

[usually passive] (formal)

Verb Forms

present simple I / you / we / they vitiate	/ˈvɪʃieɪt/ /ˈvɪʃieɪt/
he / she / it vitiates	/ˈvɪʃieɪts/ /ˈvɪʃieɪts/
past simple vitiated	/ˈvɪʃieɪtɪd/ /ˈvɪʃieɪtɪd/
past participle vitiated	/ˈvɪʃieɪtɪd/ /ˈvɪʃieɪtɪd/
-ing form vitiating	/ˈvɪʃieɪtɪŋ/ /ˈvɪʃieɪtɪŋ/

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vitiate something to destroy or reduce the effect of something使失效；削弱效用
- The ‘yes’ vote was vitiated by the low turnout in the election.“赞成”票因选举投票率低而无效。
Word Originmid 16th cent.: from Latin vitiat- ‘impaired’, from the verb vitiare, from vitium.

BNC: 23507 COCA: 30037

vitiate

To make something worse: worsen, compound, escalate...

Changes for the worse: contamination, regression, lapse...