IPA: /ɪnˈbɜrst/
KK: /ɪnˈbɜrst/
A sudden and forceful entry or occurrence, often associated with a burst of energy or emotion.
The inburst of laughter from the audience filled the room with joy.
Inburst is formed from "in-" (meaning into) and "burst" (from Old English "berstan", meaning to break or burst). The word describes the action of something breaking forth or bursting into a space.
Think of something 'breaking into' a space — 'in-' means into, and 'burst' means to break.