Definition of one-size-fits-all adjective from the Oxford Advanced Learner's Dictionary

 

one-size-fits-all

 adjective
adjective
BrE
 
; NAmE
 
[only before noun]
 
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designed to be suitable for a wide range of situations or needs a one-size-fits-all monetary policy There cannot be a one-size-fits-all answer, since different teaching methods work best in different countries.
See the Oxford Advanced American Dictionary entry: one-size-fits-all