to shake; to tremble; to sway; to be unsettled; to be unstable; to fluctuate
variation in spelling (esp. within the same text); inconsistency in spelling; orthographic variation
to shake; to tremble; to sway; to be unsettled; to be unstable; to fluctuate
vertical shaking (of an earthquake); pitch (of a ship, aircraft, etc.); pitching
horizontal shaking (of an earthquake); rolling (of a boat, aircraft, etc.); swaying
variation in spelling (esp. within the same text); inconsistency in spelling; orthographic variation