Was looking at the options and flagged a post by mistake.
I don’t think users can unflag posts, but we look at reviews multiple times a day and will resolve any incorrect ones we come across 
3 Likes
It would be cool if there was a way to anti-flag posts that have been flagged–basically, cast your vote that you don’t agree that the post should have been flagged. Then, if a post had more anti-flags than flags, it wouldn’t be hidden.