the act of causing something to move up and down (or back and forth) with quick movements;
a shaky motion; "the shaking of his fingers as he lit his pipe";
vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze; "a quaking bog"; "the quaking child asked for more"; "quivering leaves of a poplar tree"; "with shaking knees"; "seemed shaky on her feet"; "sparklin;
