to surge

https://tts.langeek.co/read?text=dG8gc3VyZ2U&hash=16c576eac540063840fbe37c555070b99faa9994&lang=en&cache-only=0&driver=googletts

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