What is the meaning of all of a sudden?

adverb

  • Without warning.
    • usage: "all at once, he started shouting"
  • Happening unexpectedly.
    • usage: "suddenly she felt a sharp pain in her side"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). all of a sudden. Retrieved September 22, 2026, from http://smartdefine.org/all_of_a_sudden/definitions/1250567
ChicagoWordNet. 2010. "all of a sudden" http://smartdefine.org/all_of_a_sudden/definitions/1250567 (accessed September 22, 2026).
HarvardWordNet 2010, all of a sudden, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/all_of_a_sudden/definitions/1250567>.
MLAWordNet. "all of a sudden" 23 October 2010. Web. 22 September 2026. <http://smartdefine.org/all_of_a_sudden/definitions/1250567>