be set against something/against doing something
be set against (something)
To be decidedly opposed to something. Most of the department is set against one of our peers becoming our boss, even temporarily. Many people in our small town are set against that big construction project, and I think you'll have a hard time changing their minds.
See also: set
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
be (ˌdead) ˈset against something/against doing something
be strongly opposed to something: I’ve tried to persuade him to move house, but he’s dead set against it. ♢ She’s not very well, but she’s set against going to the doctor.Farlex Partner Idioms Dictionary © Farlex 2017