big lie, the
big lie, the {n.}, {informal}
A major, deliberate misrepresentation of some important issue made on the assumption that a bold, gross lie is psychologically more believable than a timid, minor one.
We all heard the big lie during the Watergate months.
The pretense of democracy by a totalitarian regime is part of the big lie about its government.
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Source: A Dictionary of American Idioms
