negate
/nɪˈgeɪt/verb
with obj.
1
- nullify; make ineffective取消; 使无效：
alcohol negates the effects of the drug.
酒使药失去了效力。
2
- Logic & Grammar make (a clause, sentence, or proposition) negative in meaning【逻, 语法】否定（从句, 句子, 命题）。
3
- deny the existence of (something)否定; 否认（某物）：
negating the political nature of education.
否定教育的政治本质。
词源
early 17th cent. (in senses 1 and 3)： from Latin negat- 'denied', from the verb negare.