line on

*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.
See also: line, on
References in classic literature ?
The line on the London side of Woking station was still undergoing repair, so I descended at Byfleet station and took the road to Maybury, past the place where I and the artilleryman had talked to the hussars, and on by the spot where the Martian had appeared to me in the thunderstorm.