Definition of grey area noun from the Oxford Advanced Learner's Dictionary

 

grey area

 noun
noun
BrE
 
; NAmE
 
(especially British English)(usually North American English gray area)
 
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an area of a subject or situation that is not clear or does not fit into a particular group and is therefore difficult to define or deal with Exactly what can be called an offensive weapon is still a grey area. The new rules for police procedure cleared up a lot of grey areas.