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                           general:: 
                            Phrase(s): *on the telephone [and] *on the phone 
Fig. speaking on the telephone. (*Typically: be ~; get ~.)  •  She’s on the phone but won’t be long.  •  Please take a seat while I’m on the phone.  •  Get on the phone and call him back immediately!
                        
                        
 
                        
                            McGrawhill's American Idioms And Phrasal Verbs