<p><strong>Noun</strong></p><ul><li>a nearly spherical body of gas contained in a liquid.</li><li>a small globule of gas in a thin liquid envelope.</li><li>anything that lacks firmness, substance, or permanence; an illusion or delusion.</li><li>the act or sound of bubbling.</li><li>a domelike structure, usually of inflated plastic, used to enclose a swimming pool, tennis court, etc.</li><li>a protected, exempt, or unique area, industry, etc.</li><li>an area that can be defended, protected, patrolled, etc., or that comes under one's jurisdiction.</li><li>a zone of cognitive or psychological isolation, in which one’s preexisting ideas are reinforced through interactions with like-minded people.</li><li>a small group of people who interact or socialize exclusively with one another in order to contain the spread of a contagious disease.</li><li>an inflated speculation that causes an unsustainable increase in the value of goods, property, or other investment.</li><li>a sudden, temporary change or divergence from a trend.</li></ul><p><strong>Verb</strong></p><ul><li>(used without object) to form, produce, or release bubbles; effervesce.</li><li>(used with object) to cause to bubble; make bubbles in.</li></ul>