not hold water

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not hold water

To not be or not appear to be true, verifiable, or able to be supported by facts. The image is of a container with holes in it—a metaphor for a position or argument containing "holes" (errors or gaps in reasoning). I'm afraid that excuse just doesn't hold water with me—you still should have had plenty of time to complete the assignment and print it. That old claim has been debunked so many time that it just does not hold water any more.
See also: hold, not, water
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

not hold water

 
1. Lit. [of a container] not able to contain water without leaking. This old wading pool won't hold water any longer.
2. Fig. not able to be proved; not correct or true. Jack's story won't hold water. It sounds too unlikely. The police's theory will not hold water. The suspect has an ironclad alibi.
See also: hold, not, water

won't hold water

to be inadequate, insubstantial, or ill-conceived. Sorry, your ideas won't hold water. Nice try, though. The prosecution's case wouldn't hold water, so the defendant was released.
See also: hold, water
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

not hold water

COMMON If a theory or an argument does not hold water, you can prove that it is wrong. That explanation does not hold water, according to senior intelligence sources. It doesn't really matter that not all of the film's arguments hold water. Note: You can also say that a theory or an argument holds water, meaning that it is true or right. If these arguments hold water, then we may have to rethink our policy.
See also: hold, not, water
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
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References in periodicals archive ?
Here we go through every Wales player to demonstrate why Jones' remarks don't hold water...
"The data shows that these claims simply don't hold water."
He said concerns about discrimination against the LGBTQ community and others with alternative lifestyles don't hold water because the state overall protects access for those people, who can use other agencies.
But we know that intelligence reports don't hold water in court, ' the PNP chief said in a news conference here.
No doubt, these silly fabrications don't hold water anymore.
(Many color associations don't hold water once tested, though.
But new research is showing the old assumptions about generational differences just don't hold water. In her book, Retiring the Generation Gap: How Employees Young and Old Can Find Common Ground, Jennifer Deal draws on surveys of 3,200 employees to reach the conclusion that "Fundamentally people want the same things, no matter what generation they are from," and "All generations have similar values." She writes that "the so-called generation gap is, in large part, the result of miscommunication and misunderstanding, fueled by common insecurities and the desire for clout." Other research supports her conclusions.
If that eyesore, which stands out like a scene from a horror movie, is the reason we're asked to make up the difference in property taxes, Pryor's arguments don't hold water.
These claims simply don't hold water. DEBKAfile's military sources report that the Hermes 450 boasts a range of video and still cameras that can capture extremely high-resolution color images.
The accused's excuses don't matter, they don't hold water, they're merely diversionary tactics.
As many have pointed out, most of the arguments from Canada Post don't hold water. Canada Post has been profitable, buoyed by increased parcel deliveries.
The Jaypee Group is a ` 40,000 crore group, so Speed Week 's allegations about it going bankrupt don't hold water."
Those arguments don't hold water, and the people who would know--our military and business leaders--have made that clear.
Broader arguments about the economic impact of the ban similarly don't hold water. More than 40 medical-related conventions have been held or are scheduled to take place in Massachusetts this year.
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