retropulsion

noun3

1. •
   The pushing or forcing of something to move backwards or inwards.

   • Retropulsion of the eye slackens the rectus muscle and, if forced ductions improve with retropulsion, then the restriction is secondary to a tight rectus muscle. — 2007
2. •
   A tendency to step or walk backwards involuntarily, especially as a symptom of parkinsonism.

   • Retropulsion most often occurs when you are trying to reach for something higher than sholder level. — 1993
3. •
   (no longer used) Transfer of a disease from an external source to an internal organ.

   • The arthritic blepharoblenorrhoea and ophthalmoblenorrhoea appear only as a real metastasis of gout, having always followed its retropulsion in the great toe, from the application of cold moisture. — 1818