negate

1. V-T If one thing negates another, it causes that other thing to lose the effect or value that it had. 使無傚[正式]

These weaknesses negated his otherwise progressive attitude towards the staff. 這些缺點抹殺了他本來對工作人員的開明態度。

2. V-T If someone negates something, they say that it does not exist. 否定[正式]

He warned that to negate the results of elections would only make things worse. 他警告說否定選擧結果衹能使事態更加惡化。