Definitions from Wiktionary (retropropulsion)

▸ noun:  (astronautics) Backward propulsion, especially the use of rockets to brake or change direction.
▸ noun:  Alternative form of retropulsion (“abnormal tendency to step backwards”). [(medicine) A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism.]
▸ noun:  Alternative form of retropulsion (“forcing something to move backwards or inwards”). [(medicine) A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism.]



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