mob

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A large and often disorderly crowd. synonym: crowd.
• noun The mass of common people; the populace.
• noun Informal A criminal organization, especially the Mafia operating in the United States.
• noun An indiscriminate or loosely associated group of things.
• noun Australian A flock or herd of animals.
• transitive verb To crowd around and jostle or annoy, especially in anger or excessive enthusiasm.
• transitive verb To crowd into.

from The Century Dictionary.

• noun A mob-cap.
• To conceal or cover, as the face, by a cap or hood.
• To dress awkwardly.
• To attack in a disorderly crowd; crowd round and annoy; beset tumultuously, whether from curiosity or with hostile intent: as, to mob a person in the street.
• To scold.
• noun The common mass of people; the multitude; hence, a promiscuous aggregation of people in any rank of life; an incoherent, rude, or disorderly crowd; rabble.
• noun A riotous assemblage; a crowd of persons gathered for mischief or attack; a promiscuous multitude of rioters.
• noun A herd, as of horses or cattle; a flock, as of sheep.
• noun Synonyms Rabble, etc. See populace.

from the GNU version of the Collaborative International Dictionary of English.

• noun A mobcap.
• transitive verb To crowd about, as a mob, and attack or annoy.
• transitive verb rare To wrap up in, or cover with, a cowl.
• noun The lower classes of a community; the populace, or the lowest part of it.
• noun A throng; a rabble; esp., an unlawful or riotous assembly; a disorderly crowd.
• noun law administered by the mob; lynch law.
• noun [Slang] well dressed thieves and swindlers, regarded collectively.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An unruly group of people.
• noun A commonly used collective noun for animals such as horses or cattle.
• noun The Mafia, or a similar group that engages in organized crime (preceded by the).
• noun video games A non-player character that exists to be fought or killed to further the progression of the story or game.
• verb transitive To crowd around (someone), often with hostility.
• verb transitive To crowd into or around a place.
• verb video games The act of a player aggroing enemies so they follow them and gather, forming a mob of foes.
• abbreviation mobile phone

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an association of criminals
• verb press tightly together or cram
• noun a disorderly crowd of people
• noun a loose affiliation of gangsters in charge of organized criminal activities