noun, noun or participle which takes 'suru', intransitive verb
sudden change; sudden turn
Describes a rapid, often unexpected shift in a situation, condition, or state. Used as both a noun and a suru-verb.
天候が急変したので、試合は中止になった。
The weather suddenly changed, so the game was canceled.
病状
His condition took a sudden turn, requiring emergency surgery.
noun
emergency; sudden accident
Refers to a sudden, serious incident or crisis, often medical or safety-related. Used as a noun.
急変に備えて、防災訓練を行った。
We conducted a disaster drill to prepare for emergencies.
患者に急変が起きたときは、すぐに医師を呼んでください。
If a sudden change occurs in the patient, call a doctor immediately.