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general::
Phrase(s): *a line on someone or something
Fig. an idea on how to locate someone or something; an idea for finding someone who can help with someone or something. (*Typically: get ~; have ~; give someone ~.) • I got a line on a book that might help explain what you want to know. • Sally has a line on someone who could help you fix up your apartment.
McGrawhill's American Idioms And Phrasal Verbs