vitiate
/ˈvɪʃɪeɪt/verb
with obj.
1- formal spoil or impair the quality or efficiency of〈正式〉使变质; 使效率降低：
development programmes have been vitiated by the rise in population.
人口上升影响了发展计划的效果。
1.1
- destroy or impair the legal validity of使失去法律效力。
派生词
vitiation
nounvitiator
noun词源
mid 16th cent.: from Latin vitiat- 'impaired'， from the verb vitiare, from vitium （see VICE1 ）.