To collapse inward violently. The building imploded after the demolition charges were detonated.
To undergo a sudden and complete failure or collapse. The company imploded after the scandal was revealed.
To burst inward due to external pressure. The submarine imploded under the immense pressure of the deep ocean.
To cause (something) to collapse inward deliberately, especially by the use of explosives; to demolish by implosion. Contractors imploded the outdated stadium within seconds.