沉香當爛柴 [－－当烂－]

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Definitions (粵典–words.hk)
  1. 語句
    指人​唔​識貨​，​唔​識​得​好似​沉香​咁​珍​貴​嘅​嘢​嘅​價​值​，​將​佢​當​做​普通​貨色​，​浪費​咗​樣​嘢
    to waste valuable goods; literally: to take agarwood as decayed firewood
  2. 參看
    上好沉香當爛柴