What is the definition of Clusters Fear?

"Clusters fear" is like saying, when a bunch of your favorite horror movies, eerie books, and spooky TV shows suddenly appear in your mind at the same time. It's the universal anxiety when your brain, like a horror movie buff, suddenly realizes it's not alone in its terror.

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Here's an unsettling example sentence: "As the clusters fear of the shadowy figure in the alley, they began to whisper tales of an ancient, spectral librarian who'd never forget a misplaced book title."