The term 'quaking' is used to describe a variety of trembling, shaking, and vibrating motions. The crossword solutions for this term include 'TREMOR' (6 letters), 'SHAKY' (5 letters), 'PULSATING' (9 letters), 'WOBBLING' (8 letters), 'TOTTERING' (9 letters), 'SHUDDERING' (10 letters), 'ATREMBLE' (8 letters), 'JOLTING' (7 letters), 'shaking' (7 letters), 'AFRAID' (6 letters), 'moving' (6 letters), 'THROBBING' (9 letters), 'JARRING' (7 letters), 'QUIVERING' (9 letters), 'SHIVERING' (9 letters), 'TREPID' (6 letters), and 'seismic' (7 letters). All of these words refer to a type of motion that is characterized by rapid, involuntary, and often rhythmic movements. This type of motion can be caused by fear, excitement, or physical activity, and can also be the result of an earthquake or other seismic event.