Definition of self-fulfilling adjective from the Oxford Advanced Learner's Dictionary

 

self-fulfilling

 adjective
adjective
BrE
 
; NAmE
 
[usually before noun]
 
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a self-fulfilling prophecy is one that becomes true because people expect it to be true and behave in a way that will make it happen If you expect to fail, you will fail. It's a self-fulfilling prophecy.
See the Oxford Advanced American Dictionary entry: self-fulfilling