ˌone-size-fits-ˈall BrE AmE adjective [only before noun]
1 . a one-size-fits-all attitude, method, plan etc is designed to please everyone or be suitable for every situation, often with the result that it is not successful:
a one-size-fits-all public education program
2 . one-size-fits-all clothes are designed so that people of any size can wear them