Sudden Increase
Surge
noun, verbal noun
A sudden increase is just that, a sudden increase or surge!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
近年の、自制心が欠けている若者の急増について、フグ先生はどうお考えですか。
What do you think about the sudden increase in the number of young people who lack self-control in recent years, Dr. Fugu?
ちょっとした批判も受け入れられない人が急増している気がします。
I feel that there's been a sudden increase in the number of people who can't accept even the slightest criticism.
振り付け師になるのが夢だという子どもが、急増しています。
The number of children who dream of being a choreographer has increased suddenly.