Definitions from Wiktionary ( )

▸ noun:  A spherically contained volume of air or other gas, especially one made from soapy liquid.
▸ noun:  A small spherical cavity in a solid material.
▸ noun:  (by extension) Anything resembling a hollow sphere.
▸ noun:  (figurative) Anything lacking firmness or solidity; a cheat or fraud; an empty project.
▸ noun:  (economics) 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.
▸ noun:  (figurative) The emotional or physical atmosphere in which a subject is immersed.
▸ noun:  An officer's station in a prison dormitory, affording views on all sides.
▸ noun:  (obsolete) Someone who has been ‘bubbled’ or fooled; a dupe.
▸ noun:  A small, hollow, floating bead or globe, formerly used for testing the strength of spirits.
▸ noun:  The globule of air in the chamber of a spirit level.
▸ noun:  (Cockney rhyming slang) A laugh.
▸ noun:  (Cockney rhyming slang) A Greek.
▸ noun:  (computing, historical) Any of the small magnetized areas that make up bubble memory.
▸ noun:  (poker) 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).
▸ noun:  (sports) The cutoff point between qualifying, advancing or being invited to a tournament, or having one's competition end.
▸ noun:  (chiefly COVID-19 pandemic) A quarantine environment containing multiple people and/or facilities isolated from the rest of society.
▸ noun:  The people who are in this quarantine.
▸ noun:  (television, slang) A bulb or lamp; the part of a lighting assembly that actually produces the light.
▸ noun:  (drug paraphernalia) A specialized glass pipe having a sphere-shaped apparatus at one end.
▸ verb:  (intransitive) To produce bubbles, to rise up in bubbles (such as in foods cooking or liquids boiling).
▸ verb:  (intransitive, figurative) To churn or foment, as if wishing to rise to the surface.
▸ verb:  (intransitive, figurative) To rise through a medium or system, similar to the way that bubbles rise in liquid.
▸ verb:  (transitive, obsolete, rare) To cover or spread with bubbles
▸ verb:  (transitive, archaic, rare) To delude, dupe, or hoodwink; to cheat.
▸ verb:  (intransitive, Scotland and Northern England) To cry, weep.
▸ verb:  (transitive) To pat a baby on the back so as to cause it to belch.
▸ verb:  (transitive) To cause to feel as if bubbling or churning.
▸ verb:  (transitive) To express in a bubbly or lively manner.
▸ verb:  (transitive) To form into a protruding round shape.
▸ verb:  (transitive) To cover with bubbles.
▸ verb:  (transitive) To bubble in; to mark a response on a form by filling in a circular area (‘bubble’).
▸ verb:  (computing) To apply a filter bubble, as to search results.
▸ verb:  (intransitive) To join together in a support bubble
▸ verb:  (transitive, UK, slang) To grass (report criminal activity to the authorities).
▸ noun:  Short for travel bubble. [(neologism) An arrangement between two (or more) countries, states, or other administrative regions, that allows free travel of residents between them while otherwise keeping their borders closed to travellers from outside the bubble.]

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