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Webster 1913 Edition

Upburst

Up′burstˊ

,
Noun.
The act of bursting upwards; a breaking through to the surface; an upbreak or uprush;
as, an
upburst
of molten matter
.

Definition 2025

upburst

upburst

English

Noun

upburst ‎(plural upbursts)

  1. (archaic) The act of bursting upwards
    an upburst of molten matter

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