Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: im- + -plode (as in explode)

implode

verb
     
im‧plode [intransitive]
1 technical to explode inwards [≠ explode]:
The windows on both sides of the room had imploded.
2 written 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]

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