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夜陰 (やいん, yain) Japanese meaning: shades of evening | Kotomora
Freq. Frequency Top 100,000 じ 字 Furigana
Related words 夜よる の 闇やみ More common and neutral term for the darkness of night; 夜陰 is more literary and often implies stealth or concealment.
夜や 陰いん に 乗じょう じて Fixed expression meaning 'under cover of darkness'; this is the most frequent context for 夜陰.
Etymology Compound of 夜 (night) and 陰 (shade, darkness). The exact historical derivation is uncertain, but the word has been used in literary Japanese to refer to the concealing darkness of night.
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Under cover of darkness, they sneaked into the enemy camp.
The culprit fled under the cover of night.