The new singer's voice is like 'a lotus rising from clear water' — naturally, effortlessly moving.
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history
From Li Bai's (李白, Tang dynasty) 《经乱离后天恩流夜郎忆旧游书怀赠江夏韦太守良宰》: 清水出芙蓉,天然去雕饰 — 'a lotus rising from clear water, natural and free of ornament.' Originally a compliment to Wei Liangzai's poetry; now shorthand for any beauty, literary or personal, that requires no embellishment.
usage
Almost always cited together with its twin 天然去雕饰. 芙蓉 (fúróng) is the lotus flower (different from the modern 芙蓉 that can also mean hibiscus); here the canonical reading is lotus.