1. (verb) outburst, burst, flare-up
a sudden intense happening
Synonyms: outburst, fusillade, volley, flare-up, fit, gush, tumultuous disturbance, blowup, explosion, effusion, salvo, ebullition, burst
2. (verb) flare up
ignite quickly and suddenly, especially after having died down
Synonyms: irrupt, erupt, flare up, flare, break open, burst out
3. (verb) erupt, irrupt, flare up, flare, break open, burst out
erupt or intensify suddenly
Synonyms: come out, flare up, intrude, catch fire, ignite, blaze up, break through, extravasate, belch, burn up, flare out, flare, break open, break, burst, break out, combust, irrupt, erupt, flame, burst out, flame up, split, explode, conflagrate, push through, recrudesce, take fire, pop out
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Synonyms for flare-up 
