The deliberate use of psychological techniques to direct the behavior of a crowd.

plural of wrong crowd

(idiomatic) A group of people thought to have a negative influence on a person's behaviour; a bad crowd.

plural of tough crowd

Use of input from large numbers of people to collectively assess the merit of something.

plural of crowd catch

(idiomatic) To work the room, especially out-of-doors.

plural of crowd surfer

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.