Collins COBUILD Advanced Learner's English Dictionary - grey area

(grey areas) Note: in AM, use 'gray area' If you refer to something as a grey area, you mean that it is unclear, for example because nobody is sure how to deal with it or who is responsible for it, or it falls between two separate categories of things. At the moment, the law on compensation is very much a grey area. ...that gray area between blue-collar laborers and white-collar professionals. N-COUNT