"grey area" simply does not work in that context.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
Last edited by GoesStation; 20-Jan-2021 at 10:46. Reason: Fix a typo.
I'm not a teacher. I speak American English. I've tutored writing at the University of Southern Maine and have done a good deal of copy editing and writing, occasionally for publication.
Yes, but you use it in English, don't you? https://www.collinsdictionary.com/di...nglish/au-fait
From Longman: "used to talk about a situation in which something is not clearly a particular thing, so that people are not sure how to deal with it"
NOTE : AE gray = BE grey