nullify

音標(biāo)發(fā)音

adj性質(zhì)的同根詞
null：無(wú)效的，無(wú)價(jià)值的；等于零的。
n性質(zhì)的同根詞
null：零，[數(shù)]空。
nullification：無(wú)效；廢棄；取消；（美）州對(duì)聯(lián)邦法令的拒絕執(zhí)行或承認(rèn)。
nullity：無(wú)效；無(wú)價(jià)值的事物或人；[數(shù)]零度；退化階數(shù)。
nullifier：廢棄者；使無(wú)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.
但他不愿在美國(guó)做，因?yàn)椋瑩Q了新工作、甚至在原公司職位變了都會(huì)取消其現(xiàn)有綠卡申請(qǐng)。
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，財(cái)政部指示各市政府停止為銀行債務(wù)提供擔(dān)保，并宣布取消全部已提供擔(dān)保的計(jì)劃。
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.
但沒(méi)有官方的法庭裁定來(lái)確認(rèn)他們的性別變化，他們擔(dān)心因離婚或者房產(chǎn)糾紛對(duì)簿公堂的時(shí)候，他們的婚姻根本無(wú)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.