1. a trembling; vibration.
  2. a state of flustered excitement or fear.

verb (used without object)

  1. to act irresolutely; vacillate.
  2. North England. to tremble with excitement or fear.

verb (intr)

  1. mainly British to be uncertain or indecisive
  2. mainly US to be in an agitated state
  3. to tremble, as with cold


  1. mainly British a state of indecision
  2. a state of agitation

1640s, “to quake, tremble,” phonetic variant of Middle English didderen (late 14c.), of uncertain origin. The sense of “vacillate, be anxious” is from 1819. Related: Dithered; dithering.

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