What is the definition of Established Fear?

An "established fear" is like the kind of phobia that's been around since the dawn of civilization, but it's not your run-of-the-mill kind. Imagine it as the type of fear that creeps into your brain after watching too many horror movies, but with a dash of existential dread and an extra layer of societal pressure. It's the kind of fear that says, "I've been there, and now you're probably wondering why you're so paranoid about getting stuck in a elevator at midnight."

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Here's an edgy example sentence using that word: "After years of being told the sun sets in the west, my established fear of twilight turned into a full-blown existential crisis, making me question if I was just too late to save my relationship."