When the owner of a pet yukkuri has left or thrown out their yukkuri, who is now a gutter trash (or wild yukkuri if it was abandoned outside a city). Can also refer to a yukkuri parent(s) disowning it's own child.
If a pet yukkuri is revoked of it's "pet" status but isn't thrown out (e.g. turned into a compost) then use demotion.
