rāʿaš רָעַשׁ ‘to shake’ (Hebrew)

Etymology^?: a primitive root

rāʿaš v
1) to quake, shake
 1a) (Qal) to quake, shake
 1b) (Niphal) to be made to quake
 1c)(Hiphil)
  1c1) to cause to quake
  1c2) to cause to spring or leap (of horse)