Main Line


a fashionable residential district west of Philadelphia.
any fashionable district where socially prominent people live.
Related formsMain-Line, adjectiveMain-Lin·er, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for most mainline

main line


  1. the trunk route between two points, usually fed by branch lines
  2. (as modifier)a main-line station
US a main road

verb mainline

(intr) slang to inject a drug into a vein

adjective mainline

having an important position, esp having responsibility for the main areas of activity
Derived Formsmainliner, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for most mainline

main line

Online Etymology Dictionary, © 2010 Douglas Harper