from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A state of indecisive agitation.
  • intransitive v. To be nervously irresolute in acting or doing.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The state of being undecided.
  • n. A form of noise which is intentionally applied to randomize errors which occur in the processing of both digital audio and digital video data
  • v. To tremble, shake, or shiver with cold.
  • v. To be uncertain or unable to make a decision about doing something.
  • v. To do something nervously.
  • v. To render an approximation of (an image, etc.) by using dot patterns in similar colours to those that are unavailable on the system.

from The Century Dictionary and Cyclopedia

  • To shake; tremble: same as didder.
  • n. A trembling; vibration.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. act nervously; be undecided; be uncertain
  • v. make a fuss; be agitated
  • n. an excited state of agitation


Alteration of didder, from Middle English didderen, to tremble.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From didder from Middle English didderen, meaning "to tremble". (Wiktionary)



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  • Molly used this word in one of the Harry Potter books when she got all excited when she found out that Ron was a prefect.

    June 29, 2012