רָעַשׁ râʻash (H7493)

to undulate (as the earth, the sky, etc.; also a field of grain), particularly through fear; specifically, to spring (as a locust)

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)

a primitive root;