暮色

Literary, evocative — favored in fiction, poetry, and travel writing. Common collocations: 暮色苍茫 (mù-sè cāng-máng, vast hazy twilight), 暮色四合 (mù-sè sì-hé, twilight closing in from all sides), 暮色降临 (mù-sè jiàng-lín, twilight descending). For neutral 'evening' use 傍晚 (bàng-wǎn).

memory

暮 = 日 (sun) sliding under 莫 / 艹 — picture the sun setting into the grass at the day's end. Pairs neatly with 朝 (zhāo, morning) in compounds like 朝暮 (zhāo-mù, dawn to dusk).