gray area

gray area idiom
Indeterminate territory, undefined position, neither here nor there. For example, There's a large gray area between what is legal and what is not. This term, which uses gray in the sense of “neither black nor white” (or halfway between the two), dates only from the mid-1900s.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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