gray area
US /ˈɡreɪ ˌer.i.ə/
UK /ˈɡreɪ ˌer.i.ə/
1.
an area of a subject or situation where there are no clear rules, or where the truth is not clear
:
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The legal implications of online content often fall into a gray area.
•
Whether that action was ethical is a bit of a gray area.