Financial/Economic:
* Bubble economy: A period of rapid economic growth fueled by speculation and inflated asset prices, often leading to a crash.
* Price bubble: A period of rapid price increases in a specific asset class, often fueled by speculation and unsustainable demand.
* Housing bubble: A period of rapid price increases in the housing market, often leading to a crash.
* Internet bubble: A period of rapid growth in the internet sector, characterized by high valuations and investment, which ended in a crash in the late 1990s.
* Pop the bubble: To cause a rapid decline in the value of assets in a bubble.
Metaphorical:
* Bubble of happiness/optimism/security: A temporary feeling of happiness, optimism, or security that is likely to burst.
* Live in a bubble: To be unaware of or sheltered from the realities of the world.
* Burst someone's bubble: To disillusion someone or reveal the truth about something they believed in.
* A bubble of hope: A small, fragile glimmer of hope in a difficult situation.
* Bubble wrap: A protective material used to cushion fragile items. (Figuratively, it can be used to describe a person who is overly protected from the world.)
Other:
* Soap bubble: A thin, spherical film of soapy water that floats in the air.
* Bubble bath: A bath in water mixed with soap or bath oil to create bubbles.
* Bubble tea: A Taiwanese tea drink with tapioca balls at the bottom.
* Bubble wrap (noun): A protective material used to cushion fragile items.
* Bubble up (verb): To boil or simmer.
These are just a few examples. There are many other expressions with "bubble" that depend on the context.