Upsurge (noun)

1. A sudden increase or rise, especially in activity, numbers, or intensity.
2. A sudden and dramatic increase in a particular activity or phenomenon.

Origin:

Mid-19th century: from up + surge.

Examples:

1. There has been an upsurge in the number of people taking up cycling in recent years.
2. The upsurge of violence in the city has caused great concern among residents.
3. The economy experienced an upsurge in growth during the last quarter.
4. There was an upsurge in demand for the company's products after the launch of the new product line.
5. The upsurge of interest in environmental issues has led to a significant increase in recycling.