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 ?
"Tried and tested" doesn't hold water in the modern consumer market.
20)--thus moving from the evocative power of a metaphor based on another metaphor ("this theory doesn't hold water, a grammar leaks") to a more abstract form that seems to better suit Romanian.
But the defensive-war justification doesn't hold water. Western governments, international human-rights organizations, and legal experts - including some from Israel - say that in prohibiting the acquisition of territory by force, international law makes no distinction between a defensive or offensive war.
As for the directed energy attacks in Cuba, the "crickets and mass hysteria" explanation doesn't hold water, Giordano said.
Local authority by-laws against public urination mean the old wives' tale that a pregnant woman can pee in a policeman's helmet doesn't hold water, so to speak.
Since last week, the Minority Bloc has argued that Lacson's claims on the presence of pork in the proposed 2019 national budget doesn't hold water since the budget has not yet been enacted.
The logic doesn't hold water, but it appears that the ATF is stating that because most bolt-action rifles consider the barreled action to be the serialised component, than a bolt-action upper must abide by the same rule of thumb.
"This story doesn't hold water. The US govt needs to demand the truth and hold the responsible parties accountable, not go along with Saudi efforts to cover up this murder," he stated.
"If it is proven, and it looks very likely to be the case, that [Prince Mohammed] ordered the killing of the journalist it is a step too far -- one that the UK, the EU and the US are going to have to respond to." He said the "rogue elements" theory of Khashoggi's death "simply doesn't hold water" and that it"further undermines respect for America when it panders to such a blatant fiction".
'The argument that they are donor-funded doesn't hold water because Kenyans will eventually pay the loans,' the lobby said.' Kescca warned that development targets in Vision 2030 and the Big Four agenda could be missed if the trend continued.
Anyhow, what the opposition leader is saying simply doesn't hold water," Pekevski explains.
It's why this whole 'He never brings through young players' is another criticism which doesn't hold water.
This doesn't hold water with the local manufacturers, of course, with one of their officials retorting about how easy it is to forge these certification documents: 'You want an inspection certificate for cement imports?
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