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This question already has an answer here:
I accidentally created an inaccurate tag on Stack Overflow - I created teaxx when I should have been using xxtea.
How can I delete it, or get it deleted?
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Retag your question. It will be removed when the cleanup scripts run next, at 03:00 UTC to(day/night).
See What happens to "zombie" tags? for more info about tag deletion.