A metaphor is a type of figurative language in which something is described as being something which it is not. It differs from a simile in that the device does not say that something is like something else, but rather that it actually is something else. However, as readers, we understand that a comparison is being made and that the description is figurative rather than literal.
In this story, the setting is arguably a metaphor in itself: the catacombs, covered with nitre, are like the web of a spider, and Montresor is drawing Fortunato deeper and deeper into that web. Montresor makes this explicit by pointing out the "white web-work," which he asks Fortunato to look at.
There are also some smaller metaphors in the language, such as where Fortunato's eyes are described as "two filmy orbs." Later, the narrator observes that "the wine sparkled in his eyes." This is not literally the case, but implies that Fortunato is looking increasingly drunk.
It could also be argued that the manner of...
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