the bubble bursts
US /ðə ˈbʌb.əl bɜːrsts/
UK /ðə ˈbʌb.əl bɜːrsts/
1.
a sudden end to a period of success or good feelings
:
•
Everything was going great until the bubble burst and the company went bankrupt.
•
He was living in a fantasy world, but then the bubble burst when he lost his job.