Etymology
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dither (v.)

1640s, "to quake, tremble," phonetic variant of Middle English didderen (late 14c.), which is of uncertain origin. The sense of "vacillate in opinion, be indecisive" is from 1908. Related: Dithered; dithering.

updated on September 09, 2018

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Definitions of dither from WordNet
1
dither (v.)
act nervously; be undecided; be uncertain;
dither (v.)
make a fuss; be agitated;
Synonyms: flap / pother
2
dither (n.)
an excited state of agitation;
he was in a dither
Synonyms: pother / fuss / tizzy / flap
From wordnet.princeton.edu, not affiliated with etymonline.