Aliasing shrinking → shrinkage
Link to alias

Reason:

Shrinkage, similar to expansion, is a noun. Shrinking is the present tense of the verb shrink.
This would also create tags suck as body_shrinkage, cock_shrinkage, etc.

EDIT: The tag alias shrinkage -> shrinking (forum #207726) has been approved by @Rainbow_Dash.

I WAS IN THE POOL!

GtheOtter said:
...
Shrinkage, similar to expansion, is a noun. Shrinking is the present tense of the verb shrink.
This would also create tags suck as body_shrinkage, cock_shrinkage, etc.

Hmm. Personally think shrinkING tag better than shrinkAGE,
but I don't have a strong objection to this alias suggestion.

I assume that by "also create tags suck as",
you meant to write "also create tags SUCH as".

(existing general *shrink* tags include:
1 ball_shrinking general
3 breast_shrinking general
1 forced_shrinking general
141 penis_shrinking general
... 11 shrink_ray general
2 shrink_spray general
... 1 shrinking_breasts general
11 unfortunate_shrinkage general (edit: unfortunate_shrinkage not defined )

319 posts tagged with shrinking
compared with zero for shrinkage.

The latest shrinkage edit I can find (not including unfortunate_shrinkage) was 2017 Feb edit of post 997487

post_tag_history of post 997487
(edit removed shrinkage tag and didn't replace it with anything)

The tag alias shrinkage -> shrinking (forum #207726) has been approved by @Rainbow_Dash.