The act or practice of spreading false stories, fabricating tales, or peddling lies; the business of trading in fables.
From fablemonger plus -ing suffix creating a gerund (noun from verb). Describes the activity or practice of spreading fables/falsehoods.
Every generation invents new words for misinformation—fablemongering, fake news, disinformation—suggesting that spreading false stories is as old as language itself and always deserves its own special term.
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