dust and ashes
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dust and ashesused to convey a feeling of great disappointment or disillusion about something.
Often found in the fuller form turn to dust and ashes in your mouth , the phrase is used in the Bible as a metaphor for worthlessness, for example in Genesis 18:27 and the Book of Job 30:19. It derives from the legend of the Sodom apple, or Dead Sea fruit, whose attractive appearance tempted people, but which tasted only of dust and ashes when eaten.