'Bestir' in the Bible

And it shall be, when thou hearest the sound of marching in the tops of the mulberry-trees, that then thou shalt bestir thyself; for then is Jehovah gone out before thee to smite the host of the Philistines.

Let the nations bestir themselves, and come up to the valley of Jehoshaphat; for there will I sit to judge all the nations round about.