sudden and dramatic event; sudden strange phenomenon
Refers to an abrupt, often inexplicable occurrence or incident, typically with a dramatic or mysterious quality. Used in narrative or descriptive contexts.
A sudden and strange phenomenon occurred in the town, throwing people into confusion.
A sudden and dramatic event was reported, and an investigation team was dispatched.
Compound of 突如 (sudden) and 異変 (unusual event). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning.