#1 outburst n. [effusion, gush, blowup, ebullition] an unrestrained expression of emotion. wn
#2 outburst n. [burst, flare-up] a sudden intense happening; "an outburst of heavy rain"; "a burst of lightning". wn
#3 outburst n. [tumultuous disturbance] a sudden violent disturbance. wn
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