[UP- 2.] An upward outburst or outbreak.
1843. Penny Cycl., XXVI. 424/2. A violent upburst of clouds scoriæ and ashes.
1872. Bp. Forbes, Kal. Sc. Saints, 290. A scarped upburst of trap-rock out of the surrounding red sandstone.
1876. Mrs. Whitney, Sights & Ins., II. xxxv. 642. The great upburst of gladness.
