mob - definition in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online (US)

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mob

noun [+ 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 were/was hanging out at the bar. [S] informal an organization of criminals: a New York mob leader
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mob

verb [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 the Old Town 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 Learners Dictionary & Thesaurus © Cambridge University Press)
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