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English definition of “bubble”

bubble

noun [C]
 
 
/ˈbʌbl/ ECONOMICS
a temporary period when a lot of people invest in a stock, property, or a product that becomes much more expensive than its real value: After the tech bubble burst, few investors were willing to put their money into developing companies.
a period of great success, which usually ends very suddenly: Economists fear that the economic bubble will pop and lead to a new recession.
(Definition of bubble from the Cambridge Business English Dictionary © Cambridge University Press)
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