Definitions

1. verb

to burst forth suddenly and violently

“The volcano irrupted and sent lava flowing down the mountain”

2. verb

to break out or appear suddenly and violently

“The riot irrupted in the streets and police were called in”

3. noun

a sudden and violent outbreak or bursting forth

“The irruption of the volcano caused widespread destruction”

4. noun

an eruption or outbreak, especially of a volcano or disease

“The irruption of the disease spread rapidly through the population”