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out·burst / ˈoutˌbərst/ • n. a sudden release of strong emotion: “she screamed at him about it one day,” said one source who witnessed the outburst. ∎  a sudden outbreak of a particular activity: a wild outburst of applause. ∎  a volcanic eruption. ∎ Physics a sudden emission of energy or particles: a very dramatic outburst of neutrons.