Definition of “mob” - English Dictionary

“mob” in British English

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mobnoun [ + sing/pl verb ]

uk /mɒb/ us /mɑːb/

[ C ] usually disapproving a large, angry crowd, especially one that could easily become violent:

The angry mob outside the jail was/were ready to riot.
a lynch mob
50 people were killed in three days of mob violence.

[ C ] informal a group of people who are friends or who are similar in some way:

The usual mob was/were hanging out at the bar.

[ S ] informal an organization of criminals:

a New York mob leader
See also

mobverb [ T ]

uk /mɒb/ us /mɑːb/ -bb-

[ T usually passive ] to come together around someone in a crowd to express admiration, interest, or anger:

They were mobbed by fans when they arrived at the theatre.
Let's not go to that bar tonight - it's always mobbed (= there are always a lot of people there) on Fridays.

[ I or T ] When birds or small animals mob a bigger or more frightening bird or animal that is hunting them, they attack it together and force it to go away.

(Definition of “mob” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“mob” in American English

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mobnoun [ C ]

us /mɑb/

a large group of people gathered together who are often uncontrollable or violent:

He arrived at the airport to find a mob of adoring fans waiting for him.

The mob is also an organization of criminals, esp. the Mafia.

mobverb [ T ]

us /mɑb/ -bb-

to gather in a large group around someone to express admiration, interest, or anger:

She was mobbed by her fans.
The stores are always mobbed (= very crowded) on Saturdays.

(Definition of “mob” from the Cambridge Academic Content Dictionary © Cambridge University Press)