To nail 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.
Nail"brush`, n. A brush for cleaning the nails.
Nail"er (?), n. 1. One whose occupation is to make nails; a nail maker.