"A big lie (German: große Lüge) is a propaganda technique. The expression was coined by Adolf Hitler, when he dictated his 1925 book Mein Kampf, about the use of a lie so "colossal" that no one would believe that someone "could have the impudence to distort the truth so infamously." Hitler claimed the technique was used by "the Jews" to blame Germany's loss in World War I on German general Erich Ludendorff, who was a prominent nationalist and antisemitic political leader in the Weimar Republic."

https://en.wikipedia.org/wiki/Big_lie