noun
an extreme or irrational fear of the number four
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Quadrophobia is a rare phobia characterized by an intense fear of the number four.
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I heard that Sarah has quadrophobia, so we always make sure not to mention the number four around her.
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I can't believe Mark has quadrophobia, he gets so freaked out by the number four!
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His quadrophobia extends beyond just the number four, he also avoids anything that comes in fours.