create alias leaning_on_rail -> against_railing
create implication against_railing -> railing
create alias leaning_on_person -> against_person
create alias leaning_on_object -> against_object
mass update leaning_on_broom -> against_broom
mass update leaning_against_motorcycle -> against_motorcycle
mass update leaning_against_vehicle -> against_vehicle
I'm suggesting the bulk update to bring these tags in line with the how others are handled.
Also there is leaning_over tag which has a wiki advising people to use a list of other tags instead of it. I don't think this is really workable as having a tag with posts in it is going to lead to people using it. When people begin typing out a tag and its suggested to them, of course many people will just pick it and be done. I would suggest instead, moving all of these posts to the correct respective tag and then picking an alias for it and sticking to it. Then, when people type it, they will be shoehorned into that particular tag and will judge to not use it if, as an example, their picture is leaning_to_the_side and the alias is to leaning_forward. There is also leaning_in, for which I suggest the same solution.
There is the problem with the above solution if there's an alias, that a user could type out "leaning_over" entirely without looking at the suggested tag (typing fast, disabled, etc) and then after their post change is submitted, they won't see a warning to the left that the tag has zero posts. What I would suggest is that when someone types out the antecedent of an alias that they get a notice at the top of the page that the tag they used was changed to verify that it is accurately used.
For against_object, I think what an "object" and how this tag is used should be in question since there are other against_* tags that are also against types of objects. I'm not sure if that tag should just be broken up into respective against_* tags, but I think that would be better than having a generalized one for "objects" as that will decrease searching precision (searching against_object + the type of object, "object" isn't treated as a generalized tag for objects).
And we have the tag leaning, which is tagged without regard to its carefully written wiki entry. I think the definition there isn't workable, a tag should be intuitive or people will mistag. I would suggest instead, implying all leaning_* tags to leaning or nixing it.
Edit: mass update leaning_against_vehicle -> against_vehicle, was against_motorcycle before, as per evazion pointing this out
EDIT: This bulk update request is pending automatic rejection in 5 days.
EDIT: This bulk update request has been rejected because it was not approved within 60 days.
EDIT: The bulk update request #1698 (forum #147435) has been rejected by @DanbooruBot.
Updated by DanbooruBot