"To obscure the truth" means to hide or conceal information, facts, or details that are accurate or genuine. It involves intentionally making something unclear or difficult to understand, usually to deceive or mislead others. Full definition
Erik Conway, co-author of Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming, noted that there's even a word (which he did not coin) for manufacturing of fake knowledge — «agnogenesis.» (sciencemag.org)
Senior Curator Gilbert Vicario, and featuring essays by Vicario, along with Michelle White, associate curator, The Menil Collection, Houston; and Naomi Oreskes, science historian and author of «Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming» (2010). (museumpublicity.com)
«There is a kind of deal - making and horse - trading that he engages in that I think often obscures the truth, and get so convoluted that I'm not sure he and the people around him even remember where they began,» Mr. de Blasio told the Observer. (observer.com)