(astronomy) A region of the galaxy, rich in gamma rays, thought to be caused by the central supermassive black hole

A self-contained group of friends, family or colleagues capable of providing help, especially when one of the group is in isolation

plural of bubble wrap

To cover in bubble wrap / (figuratively) To excessively protect

plural of support bubble

plural of bubble company

(UK, slang, obsolete) A sham business that swindles people.

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.

plural of travel bubble

Empty-headed; foolish.