Any type of art that attracts groups of people to view or participate. Examples include pavement drawings, sand sculpting, clowns, and mime performances.

(intransitive) To come together, to form a crowd.

A group of people who are paid to attend an event to increase attendance figures, rather than attending of their own volition.

Feeling as though one does not fit in with the people around one. / The seemingly contradictory sense that you have been singled out specifically to be ignored.

plural of flash crowd

A disease that is spread from person to person, with no animal reservoir.

plural of crowd disease

(medicine) A disease occasioned or aggravated by overcrowding, especially due to lack of ventilation.

plural of crowd-poisoning

(informal) An audience that is difficult to please.