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set on/upon sb

phrasal verb with set
 
 
/set/ verb (present tense setting, past tense and past participle set)

Definition

[often passive] to attack someone: He was set upon by a vicious dog.Physical and sexual assault and abductionSexual activity in general 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.Physical and sexual assault and abductionSexual activity in general
(Definition of set on/upon sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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