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fill a/the void

To replace someone or something that is absent or missing. No, we got that project done—Rebecca filled the void while you were on vacation. If Mike doesn't play sports this year, what will fill the void besides his trouble-making friends?
See also: fill, void

null and void

No longer valid, legitimate, or enforceable. This contract shall be rendered null and void immediately should either party fail to fulfill their obligations.
See also: and, void
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

null and void

Cliché without legal force; having no legal effect. The court declared the law to be null and void. The millionaire's will was null and void because it was unsigned.
See also: and, void
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

null and void

Canceled, invalid, as in The lease is now null and void. This phrase is actually redundant, since null means "void," that is, "ineffective." It was first recorded in 1669.
See also: and, void
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

ˌnull and ˈvoid

(formal) (of a legal agreement) no longer effective or valid: The contract was declared null and void.
See also: and, void
Farlex Partner Idioms Dictionary © Farlex 2017
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References in periodicals archive ?
It is also a hotbed of Timecrimers and Longtimers, the crossroads of Voiders, Pirates and the superrich Eloi.
In his book "The Ten Voiders of Islam", Ibn Wahhab has outlined ten nullifiers of Islam which automatically expel anyone from Islam (automatic apostasy) which are as under (Volpi, 2011, 278):
Gomha and Boone assessed urodynamic and AUS outcomes in 61 patients with incontinence from RP and TURP and found that 29.5% voided by straining with minimal detrusor contraction (<10 cm H20).[sup.16] Their subsequent analysis found that 49% of men who underwent AUS placement were "valsalva voiders."[sup.17] Lai and colleagues did a retrospective study of 129 patients with UI following RP.
Those standing in line at the elections waited for their turn to exercise their right to vote, while some members of the "Mobtiloon" ("Invalidators" or "Voiders") movement stood at a short distance from the committee center, urging people to invalidate their votes - so as for the next president to be aware that he does not enjoy the support of all Egyptians, that he is coming to the post with a meager majority, and that he must seek to prove to those who boycotted the elections, invalidated their votes or voted against him that they were wrong and that he will truly lay the foundations for building a modern state, after the havoc Egypt was subjected to for decades.
And there may be some women, for example, that are Valsalva voiders. They have a problem with voiding after a sling procedure, and you may want to stay away from a retropubic approach," Dr.