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The act of defining something so universally understood that defining it is either a philosophical exercise or a profound waste of time. This phrase is used when someone treats a basic concept as if it's esoteric knowledge, or when a manager asks for a "high-level overview" of something everyone already knows. It's the verbal equivalent of explaining what air is—you can do it, but why would you? The only people who need a wheel explained are infants, aliens, and that one coworker who somehow got hired despite never having used a computer before.
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