A small sphere of gas in a liquid, like from soap.

• A small spherical cavity or void in glass, metal, or plastic.
• The air globule seen in a spirit level.

Something insubstantial or doomed; an empty hope or project.

A market phase of irrational price inflation followed by a sharp crash.

A protective or isolated social environment around a person or group.

• A quarantine or travel arrangement limiting contact to a defined group.

To form and rise as bubbles in a liquid while heating.

• To emerge or spread upward through a system or conversation.

To speak or act with lively, effusive enthusiasm.

To mark an answer by filling in a circular option on a form.