Something becomes a common practice or widespread trend over time.
蔚然草木茂盛的样子。指一件事情逐渐发展盛行，形成一种良好风气。
范文澜《中国通史》第三编第七章第八节日本国内，自望族以至一般文士，摹仿唐诗蔚然成风。”
The habit of jogging every morning has gradually became a common practice in this community.
Learn the next connected idiom: 蔚然成风 (wèi rán chéng fēng) → 风口浪尖 (fēng kǒu làng jiān)
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