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Phrase(s): With whom do you wish to speak?
a polite phrase used by people who answer the telephone to find out whom the caller wants to speak to. (Compare this with Who do you want to talk to?) • John answered the telephone and then said, "With whom do you wish to speak?" • Tom (answering the phone): Good morning, Acme Air Products. With whom do you wish to speak? Sue: Sorry, I have the wrong number. Tom: That’s perfectly all right. Have a nice day.
McGrawhill's American Idioms And Phrasal Verbs