One of the mysteries of the English language finally explained.
1Juice extracted or made from prunes.
2Slang (chiefly US). Nonsense; ‘hogwash’.
That resembles prune juice in colour; dark purplish-brown; specifically designating sputum of this colour, especially as a symptom of pneumococcal pneumonia. Now rare.
Mid 19th century. From prune + juice.
prune juice/ˈpruːn dʒuːs/
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