nullify

音标发音

adj性质的同根词
null：无效的，无价值的；等于零的。
n性质的同根词
null：零，[数]空。
nullification：无效；废弃；取消；（美）州对联邦法令的拒绝执行或承认。
nullity：无效；无价值的事物或人；[数]零度；退化阶数。
nullifier：废弃者；使无效者；取消者。

But he doesn't want to do so in the U.S. because assuming a new job or even changing titles within his own company would nullify his existing green card application.
但他不愿在美国做，因为，换了新工作、甚至在原公司职位变了都会取消其现有绿卡申请。
In late 2009 the Ministry of Finance instructed municipal governments to stop providing guarantees for bank debt and announced plans to nullify all guarantees already provided.
2009年底，财政部指示各市政府停止为银行债务提供担保，并宣布取消全部已提供担保的计划。
blog.sina.com.cn
But without the weight of a court order officially recognizing their gender reassignment, they worry any legal challenge, such as a divorce or estate dispute, would nullify the marriage.
但没有官方的法庭裁定来确认他们的性别变化，他们担心因离婚或者房产纠纷对簿公堂的时候，他们的婚姻根本无效。

Pyongyang says it will completely nullify a bilateral agreement with the South that was put in place to prevent clashes in waters west of the Korean peninsula.

Across the country, dozens of bills have been introduced to nullify federal firearms laws alone.
NPR: States' Rights Bills Surge In GOP States
Diesel fuel for all those generators is exorbitantly expensive and can easily nullify any profits.
ECONOMIST: Nigeria
From 1994 Equitable sought to nullify the value and the potential cost of these guarantees.
ECONOMIST: Equitable Life: The blame game

To nullify a legal decision or procedure means to declare that it is not legally valid.
To nullify something means to make it have no effect.