To lament or express one's misfortune only when impoverished or in dire straits, implying that prosperity silences such expressions of sorrow.
他过去挥霍无度时从不思考，如今家道中落，才开始穷唱渭城，后悔莫及。
He never reflected on his actions when he was squandering his wealth, but now that his family fortunes have declined, he's 'singing the Weicheng song in poverty,' filled with regret.
Era:
Modern
Frequency:
Story:
During the Tang Dynasty, Liu Yuxi, a Grand Mentor to the Crown Prince, would pass by a humble dwelling every day on his way to court.
He heard a man selling flatbreads sadly singing Wang Wei's poem 'Weicheng Song.' The poem goes: 'Morning rain in Weicheng has settled the dust, the guesthouses are green with fresh willows. I urge you to drink one more cup of wine, for west of Yangguan, there will be no old friends.'
Liu Yuxi gave him ten thousand coins to expand his business, and from then on, he never heard the man sing that song again.
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