WordWeb Online

1. Extreme nervousness
   "renewed jitters in the wake of a blip in retail sales";
   - heebie-jeebies [informal], screaming meemies [N. Amer, informal], jim-jams [informal], screaming abdabs [Brit, informal]

1. Small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources
    
2. A small irregular movement

Type of: disturbance, interference, motion, movement, nerves, nervousness, noise

Encyclopedia: Jitters