1.
sharp increase, dramatic rise, surge
A sudden and significant increase in quantity or number.
観光客が激増している。
The number of tourists is surging.
インターネット利用者の激増により、サーバーが混雑した。
The server became congested due to the sharp increase in internet users.
感染者数が激増したため、対策が必要になった。
Countermeasures became necessary because the number of infected people surged.
RELATED WORDS:
- 急増 - rapid increase (similar but slightly less dramatic)
- 増加 - increase (neutral, general term)
- 増大 - enlargement, growth
激増 emphasizes both speed and magnitude of increase.
OPPOSITE:
- 激減 - sharp decrease, dramatic drop
COMMON PATTERNS:
- 〜が激増する (something surges)
- 激増している (is surging)
[Register: Neutral to Formal, often used in news/reports]