Final answer:
A "pileup" of details occurs when a description contains too much sensory information, overwhelming the reader and making it difficult to visualize the scene.
Step-by-step explanation:
A "pileup" of details refers to a description containing too much sensory information, which can overwhelm a reader. It occurs when an author includes an excessive amount of descriptive elements, such as sensory details and imagery, in a passage or description. This can make it difficult for the reader to comprehend and visualize the scene.
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