verb-intransitive. To be agitated with quick, short motions continually repeated; to shake with fear, cold, etc.; to shudder; to tremble.verb-intransitive. To shake, vibrate, or quiver, either from not being solid, as soft, wet land, or from violent convulsion of any kindv. To cause to quake.n. A tremulous agitation; a quick vibratory movement; a shudder; a quivering.