Moderators, could you please delete the tags pharase, opposites and contradictions? Thanks!
2 Answers
So long as they aren't attached to any questions, they should automatically disappear within 24 hours. If that doesn't happen, please report it as a bug!
Additionally, see:
Should We Zap The Low-Occurrence Tags?
I've implemented a routine that removes tags created more than 6 months ago which have been used only a single time. It will run monthly.