Etymology
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jitter (v.)

"to move agitatedly," 1931, American English, of unknown origin; see jitters. Related: Jittered; jittering.

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Definitions of jitter

jitter (n.)
small rapid variations in a waveform resulting from fluctuations in the voltage supply or mechanical vibrations or other sources;
jitter (n.)
a small irregular movement;
From wordnet.princeton.edu