jitter

[jit-er]
noun
1.
jitters, nervousness; a feeling of fright or uneasiness (usually preceded by the ): Every time I have to make a speech, I get the jitters.
2.
fluctuations in the image on a television screen or in copy received by facsimile transmission, caused by interference or by momentary failures of synchronization.
verb (used without object)
3.
to behave nervously.

Origin:
1920–25; variant of chitter to shiver (Middle English chiteren), gradational variant of chatter

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World English Dictionary
jitter (ˈdʒɪtə)
 
vb
1.  (intr) to be anxious or nervous
 
n
2.  the jitters nervousness and anxiety
3.  electronics small rapid variations in the amplitude or timing of a waveform arising from fluctuations in the voltage supply, mechanical vibrations, etc
 
[C20: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Helpful tips for mom and dad on how to ease preschool jitters are provided.
He also kept using people's real names, giving the others serious jitters.
The mere words give parents the jitters, which is partly why the college pickup
  culture has received so much attention.
In any case it would be exciting if the experiment does see any jitters as it
  would open up a whole new area for research.
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