The phrase "big misunderstanding" refers to a situation where people have misunderstood or misinterpreted something important, leading to confusion or conflict. Full definition
This brings me to Phillip Pullman's biggest misunderstanding about Christian teaching. (faith.org.uk)
One big misunderstanding between real estate agents and appraisers centers on how, when, and what they can communicate about the valuation process, said panelists at a Valuation Forum on Saturday at the 2013 REALTORS ® Conference & Expo. (realtormag.realtor.org)
«George will somehow claim to be the victim of this great big misunderstanding, and make the news media feel badly and want to stop asking questions,» Astorino said. (nystateofpolitics.com)