mob
noun /mɒb/
  /mɑːb/
Idioms - [countable, singular + singular or plural verb] a large crowd of people, especially one that may become violent or cause trouble
- an angry/unruly mob
 - The mob was/were preparing to storm the building.
 - an excited mob of fans
 - mob rule (= a situation in which a mob has control, rather than people in authority)
 
Extra Examples- the lawless days of mob rule and anarchy
 - An angry mob of demonstrators came charging around the corner.
 - He was greeted by a mob of well-wishers eager to shake his hand.
 - Let's get out of here before the mob gets out of control.
 
Oxford Collocations Dictionaryadjective- angry
 - hostile
 - unruly
 - …
 
- form
 - join
 - lead
 - …
 
- attack somebody/something
 - chase somebody
 - descend on somebody/something
 - …
 
- mentality
 - justice
 - rule
 - …
 
 - [countable, usually singular] (informal) a group of people who are similar in some way synonym gang
- All the usual mob were there.
 
 - the Mob[singular] (informal) the people involved in organized crime; the Mafia
 - [countable] (Australian English, New Zealand English) a group of animals synonym flock, herd
- a mob of cattle
 
 
Word Originlate 17th cent.: abbreviation of archaic mobile, short for Latin mobile vulgus ‘excitable crowd’.
Idioms 
the heavy mob/brigade 
- (British English, informal) a group of strong, often violent people employed to do something such as protect somebody