to surge

https://tts.langeek.co/read?text=dG8gc3VyZ2U&hash=e166402b03f566d8db6a32f497cbf84bddebfe1c&lang=en&cache-only=0&driver=googletts&accent=US

Here you will find the vocabulary from Unit 3 - 3D in the Insight Advanced coursebook, such as "slump", "plummet", "fluctuating", etc.