trembling

intransitive verb trembled, trembling

1. to shake involuntarily from cold, fear, excitement, fatigue, etc.; shiver
2. to feel great fear or anxiety
3. to quiver, quake, totter, vibrate, etc.
4. to quaver: her voice trembled

noun

1. 1. the act or condition of trembling
   2. a fit or state of trembling
2. ☆ a disease of cattle and sheep caused by a poisonous, oily alcohol contained in certain plants, as white snakeroot, and characterized by muscular tremors and a stumbling gait: communicated to humans as milk sickness