bubble.

A spherically contained volume of air or other gas in a liquid, commonly a soapy liquid.

A small spherical cavity in a solid material.

bubbles in window glass, or in a lens

Anything resembling a hollow sphere.

Anything lacking firmness or solidity; a cheat or fraud; an empty project.

A period of intense speculation in a market, causing prices to rise quickly to irrational levels as the metaphorical bubble expands, and then fall even more quickly as the bubble bursts.

real estate bubble

dot-com bubble

The emotional or physical atmosphere in which a subject is immersed; especially, a homogeneous atmosphere in which subjects are spared exposure to culture or ideas different from their own.

An officer's station in a prison dormitory, affording views on all sides.

Someone who has been ‘bubbled’ or fooled; a dupe.

A small, hollow, floating bead or globe, formerly used for testing the strength of spirits.

The globule of air in the chamber of a spirit level.

A laugh.

Are you having a bubble?!

A Greek.

Any of the small magnetized areas that make up bubble memory.

In a poker tournament, the point before which eliminated players receive no prize money and after which they do; the situation where all remaining players are guaranteed prize money (in this case, the players are said to have made the bubble); the situation where all remaining players will be guaranteed prize money after some small number of players are eliminated (in this case, the players are said to be on the bubble).

Many players tend to play timidly (not play many hands) around the bubble, to keep their chips and last longer in the game.

The cutoff point between qualifying, advancing or being invited to a tournament, or having one's competition end.

bubble watch

A quarantine environment containing multiple people or facilities isolated from the rest of society.

The people who are in this quarantine.

Ellipsis of travel bubble.

A bulb or lamp; the part of a lighting assembly that actually produces the light.

A specialized glass pipe having a sphere-shaped apparatus at one end.

To produce bubbles, to rise up in bubbles (such as in foods cooking or liquids boiling).

The laminate is bubbling.

To churn or foment, as if wishing to rise to the surface.

Rage bubbled inside him.

To rise through a medium or system, similar to the way that bubbles rise in liquid.

To cover or spread with bubbles

To delude, dupe, or hoodwink; to cheat.

To cry, weep.

To pat a baby on the back so as to cause it to belch.

To cause to feel as if bubbling or churning.

To express in a bubbly or lively manner.

To form into a protruding round shape.

To cover with bubbles.

To bubble in; to mark a response on a form by filling in a circular area (‘bubble’).

To apply a filter bubble, as to search results.

To join together in a support bubble

To grass (report criminal activity to the authorities).