retropulsion

== English == === Etymology === From retro- + pulsion. === Noun === retropulsion (countable and uncountable, plural retropulsions) (medicine) A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism. (medicine) The pushing or forcing of something to move backwards or inwards. (medicine, obsolete) Transfer of a disease from an external source to an internal organ.