Etymology
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outburst (n.)

"a breaking or bursting out, a violent issue," 1650s, from the verbal phrase; see out (adv.) + burst (v.). Outbresten was a verb in Middle English (mid-12c.), from Old English utaberstan. Carlyle (1837) apparently coined inburst (n.) to be its opposite.

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Definitions of outburst

outburst (n.)
an unrestrained expression of emotion;
Synonyms: effusion / gush / blowup / ebullition
outburst (n.)
a sudden violent disturbance;
Synonyms: tumultuous disturbance
outburst (n.)
a sudden intense happening;
an outburst of heavy rain
Synonyms: burst / flare-up
From wordnet.princeton.edu