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to get late; to advance; to wear on
夜が更けても仕事が終わらなかった。
The work wasn't done even as night grew late.
夜が更けた頃、ようやく原稿が完成した。
The manuscript was finally completed when the night had grown late.
秋が更けている山里は静かだった。
The mountain village where autumn was deepening was quiet.