In the story, "The Cask of Amontillado," the term "quack" likely refers to an unskilled person who claims special knowledge in a specific field.
Quack in the context of the sentence from "The Cask of Amontillado" likely means an unskilled person who claims special knowledge in a specific field. This is evident as it describes Fortunato as being insincere and lacking true expertise in painting and gemmary, but pretending to have knowledge in those areas.
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