up until now, the only use for pumpkinification has been in the sense of 'making a pumpkin of', extravagant or absurdly uncritical glorification, suggested by the travesty (ascribed to Seneca) of the apotheosis of the Roman emperor Claudius Cæsar under the title of ‘apocolocyntosis’.

recrudescence originally referred to the renewal of a quality or state of things (usually one regarded as bad), a disease, epidemic, etc. through transferral [oh no, not that again!] it has come to also mean revival or rediscovery (of something regarded as good or valuable).

retrograde - To turn back, reverse, revert; to make, or cause to become, retrograde. Now rare.