great white whale
definitions
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a large whale, often used metaphorically to represent a formidable challenge or enemyes: una ballena grande, a menudo usada metafóricamente para representar un desafío formidable o un enemigo
examples
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Moby Dick is the great white whale that haunts Captain Ahab's dreams.
Moby Dick es la gran ballena blanca que persigue los sueños del capitán Ahab.