to tremble

verb
  1. To shake involuntarily, typically as a result of anxiety, excitement, or frailty. verb
    She began to tremble with fear as the thunderstorm approached.
    His hands trembled slightly as he delivered his speech.
  2. To be affected with a slight shaking motion, often due to cold or emotion. verb
    The leaves trembled in the gentle breeze.
    He felt the ground tremble beneath his feet during the earthquake.
  3. A state or instance of trembling. noun
    There was a tremble in her voice as she spoke.
    He felt a tremble of excitement as he opened the letter.