Also, on the lines of. Roughly similar or in keeping with. For example, We told the architect we want a design along the lines of his own house but smaller, or Jane asked the caterer for a menu on the lines of the Morgans' wedding reception. This idiom uses line in the sense of “a direction or procedure,” a usage dating from the early 1600s.
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.