bubblebub·ble /ˈbʌbəl/ noun [countableC]1FINANCEwhen a lot of people buy shares in a company that is financially weak, with the result that the price of the shares becomes much higher than their real valueA speculative bubble may have been responsible for the rapid rise in share prices.
The boom that created the bubble economy is over.
2COMMERCE the bubble bursts if the bubble bursts in a particular area of business, a period of growth and success ends suddenlySoftware companies enjoyed rapid expansion before the bubble burst and market growth slowed.