(n.) A bursting forth; eruption; insurrection; as an outbreak of measles\.

A alpha beginning belch blast-off blaze burst cascade civil disorder commencement convulsion creation cutting edge cyclone dawn debouchment dissiliency edge emeute eructation eruption establishment explosion fit flare-up flying start foundation fresh start gale general uprising gush gust hurricane institution insurgence insurgency insurrection irruption jacquerie jet jump-off kick-off leading edge levee en masse mutiny new departure oncoming onset opening origin origination outburst outset paroxysm peasant revolt putsch rapids rebellion revolt revolution riot rising running start rush seizure send-off setting in motion setting-up spasm spate spew spurt square one start start-off starting point storm take-off tempest tornado torrent upheaval uprising volcan whirlwind