暮色蒼然 (ぼしょくそうぜん) Japanese meaning | KotomoraMeanings
1
taru-adjective, adverb taking the 'to' particle
dusky; somber twilight
yojijukugo (four-character idiom)
Literary yojijukugo describing the deepening gloom of dusk. Used in poetic or descriptive prose, often with たる or と.
あたりは暮色蒼然として、人影もまばらだった。
The area was dusky and there were few people around.