If a user has 31 Karma, they can flag submissions. Although submissions cannot be downvoted, flags act as a "super" downvote and enough flags will strongly reduce the rank of the submission, or kill it entirely (flagging is supposed to be used for submissions which break the site guidelines, but that isn't always the case in practice). A submission that's flagged to death will have a [flagged] tag. Comments behave similarly. See: https://github.com/minimaxir/hacker-news-undocumented for more.
spooneybarger 281 days ago [-]
What does "flagged to death" mean given that you can see them?
Even users who aren't logged in can see them so... I'm not really sure what the point is. Is it so the submitter knows they got flagged a lot?