Meaning of “set on/upon sb” in the English Dictionary

british dictionary

"set on/upon sb" in British English

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set on/upon sb

phrasal verb with set uk /set/ us /set/ verb present participle setting, past tense and past participle set

[ often passive ] to attack someone:

He was set upon by a vicious dog.

to surround or catch someone and prevent them from escaping:

As he left the theatre, the singer was set upon by fans desperate for autographs.

(Definition of “set on/upon sb” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)