A ban that applies to or affects all or the majority of a given class of people or things. Can't the government put a blanket ban on solicitors? Literally no one wants someone to show up at their house, unannounced, trying to sell something. The school is introducing a blanket ban on smart phones during school hours, much to the chagrin of its students.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.