<p><strong>Verb</strong></p><ul><li>trembled, trembling.</li><li>to shake involuntarily with quick, short movements, as from fear, excitement, weakness, or cold; quake; quiver.</li><li>to be troubled with fear or apprehension.</li><li>(of things) to be affected with vibratory motion.</li><li>to be tremulous, as light or sound: His voice trembled.</li></ul><p><strong>Noun</strong></p><ul><li>the act of trembling.</li><li>a state or fit of trembling.</li><li>trembles (used with a singular verb) Pathology: milk sickness.</li><li>Veterinary Pathology: a toxic condition of cattle and sheep caused by the eating of white snakeroot and characterized by muscular tremors.</li></ul>