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a lie or an assertion
a lie or an assertion, etc., to detect and expose it, so as to put a stop to its currency; -- an expression probably derived from the former practice of shopkeepers, who were accustomed to nail bad or counterfeit pieces of money to the counter...
see also nail

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The following video provides you with the correct English pronunciation of the word "a lie or an assertion", to help you become a better English speaker.