noun, noun or participle which takes 'suru', intransitive verb
sudden change; drastic change; upheaval
Describes a dramatic, often unexpected transformation in a situation, condition, or appearance. Can be used as a noun or with する to mean 'to change drastically'.
新社長の就任で会社の雰囲気が激変した。
The atmosphere in the company changed drastically with the new president's appointment.
この町はここ数年で激変を遂げた。
This town has undergone a dramatic transformation in the last few years.