(comparative more gray-collar, superlative most gray-collar)
From gray and collar by extension of white-collar and blue-collar, perhaps with gray being seen as intermediate between white and blue.
"gray-collar." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/gray-collar>.
gray-collar. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/gray-collar
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