Definition of call on/upon phrasal verb from the Oxford Advanced American Dictionary

 

call on/upon

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    call on/upon somebody

    (formal)
     
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  1. 1to formally invite or ask someone to speak, etc. I now call upon the chairman to address the meeting.
  2. 2 to ask or demand that someone do something I feel called upon to (= feel that I should) warn you that…