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Longman Dictionary of Contemporary English
greying
noun
EXAMPLES FROM CORPUS
▪ The greying of nations is presented as an inescapable world wide pandemic from which there is no escape.
▪ The greying of the City, you could euphemistically call it.
Wiktionary
greying

vb. (present participle of grey English)

Wikipedia
Greying (The Banner album)

Greying is the fourth full-length album released by The Banner on Good Fight Music on December 9, 2014. The album was the band's first in six years and is distinct from their past releases for its use of post-punk and stronger influences of industrial metal and Gothic metal than what was found on their previous albums. The track "She Upon the Black Wolf" features guest vocals by Gallows vocalist Wade MacNeil.