Definition of reality check noun from the Oxford Advanced Learner's Dictionary

 

reality check

 noun
noun
BrE
 
; NAmE
 
[usually singular](informal)
 
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an occasion when you are reminded of how things are in the real world, rather than how you would like things to be It’s time for a reality check—you’re never going to finish that book.
See the Oxford Advanced American Dictionary entry: reality check