To change the direction or purpose of something, or to point something toward a new target or goal.
From 're-' (again) + 'direct' (from Latin 'dirigere,' to guide). A modern English formation combining a prefix meaning 'again' with the action of directing.
Traffic engineers use redirection constantly—a well-placed sign or road change can dramatically improve flow, but they've learned that redirecting too many drivers at once creates backup, so timing is everything.
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