Yes, I understand this, and that's something that sometimes happens with words. But the use of "Big Lie" in this context (i.e. capitalized, a concept about lying) is like the use of "Final Solution": sure, it could be used in another context different to what the Nazis meant by it, but how probable is that? All the examples in Wikipedia are Nazi-related.

I'll be happy to stand corrected if you can point me to a single use of this concept of "Big Lie" -- referred to unequivocally as the concept we're debating here, of telling a lie so big people won't accept it's not true -- that does not refer to the alleged "betrayal of Germany" meant by Hitler, or its related Nazi myths and propaganda.

At this point I'm only asking you for an example. To be honest I don't think there is, just as there is no other use of Final Solution, but of course I can be proven wrong.