I. (ˈ) ̷ ̷| ̷ ̷ intransitive verb
Etymology: Middle English outbersten, outbresten, from out + bersten, bresten to burst — more at burst
: to burst out
II. ˈ ̷ ̷ˌ ̷ ̷ noun
Etymology: out (III) + burst (after burst out, v.)
1. : a bursting out : a violent expression or demonstration of intense feeling
an outburst of rage
an outburst of affection
2. : a sudden or intense surge of activity or growth
furious outbursts of swirling flame — Laurence Binyon
new outbursts of creative power — C.E.Montague
an outburst of vegetative life — Samuel Van Valkenburg & Ellsworth Huntington
3.
a. : eruption
successive volcanic outbursts which covered the area with dust, pumice, and mudflows — Biological Abstracts
b. : a cosmic explosion (as of a nova or supernova)
Nova (U) Scorpii has had three outbursts — Science