|Origin:||im- + -plode (as in explode)|
to explode inwards [≠ explode]:
The windows on both sides of the room had imploded.
if an organization or system implodes, it fails suddenly, often because of faults that it has [= collapse]:
Most nations learned their lesson during the 1930s when trade imploded and incomes plunged.
—implosion noun [uncountable and countable]