nail a/the lie

nail a/the lie

To prove, expose, or demonstrate that something is false. Often used in the phrase "nail the lie that (something is the case)." The model has gone on record numerous times to nail the lie that her photographs had been digitally altered by the magazine. We're working to nail a lie that has continued to be spread for years: that simply giving up carbs will help you permanently lose weight.
See also: lie, nail
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

nail a lie

BRITISH, JOURNALISM
If you nail a lie, you show that something is definitely not true. Top designer Calvin Klein is one of those helping to finally nail the lie that young is best.
See also: lie, nail
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012

nail a lie

expose something as a falsehood or deception.
The reference here is to shopkeepers nailing forged coins to their shop counter to expose them and put them out of circulation, or to farmers pinning dead vermin to a barn door as a deterrent to others.
See also: lie, nail
Farlex Partner Idioms Dictionary © Farlex 2017
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