The tag alias #47064 knifeplay -> knife_play has been approved.
Reason: They are not currently aliased together, but I'm pretty sure they mean the same thing.
https://e621.net/posts?tags=knife_play has 15 hits.
https://e621.net/posts?tags=knifeplay has 8 hits.
Thanks!
EDIT: The tag alias knifeplay -> knife_play (forum #295853) has been approved by @Millcore.
Updated by auto moderator