"to move agitatedly," 1931, American English, of unknown origin; see jitters. Related: Jittered; jittering.
Entries linking to jitter
jitters n.
"extreme nervousness," 1925, American English, perhaps an alteration of dialectal chitter "tremble, shiver," from Middle English chittern "to twitter, chatter."
jittery adj.
1931, American English, from jitter + -y (2). Related: Jitteriness.