jitter

/ˈdʒɪtər/
verb
  1. To make small, quick, nervous movements; to shake or tremble slightly.
    • She jittered nervously as she waited for the test results.
    • The puppy jittered with excitement when it saw its owner.
    • The old car jittered along the bumpy road.
Antonyms
noun
  1. A state of nervousness or unease; small, quick movements or vibrations.
    • He had the jitters before his big presentation.
    • I always get a jitter in my leg when I'm anxious.
    • The camera's jitter made the video hard to watch.