[ uhp-burst ]
/ ˈʌpˌbɜrst /
a burst upward.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for upburst
The machine, with its human freight, lifted in an upburst of smoke, and sank down a mass of wreckage and death.The Iron Heel|Jack London