Dictionary
main' line'
1. a principal line or route of a railroad, as contrasted with a branch or secondary one.
2. a principal highway.
3. Slang.
a. a prominent and readily accessible vein of the body that may be used for a narcotic's injection.
b. the act of mainlining.
Main' Line"
1. a fashionable residential district west of Philadelphia.
2. any fashionable district where socially prominent people live.
main•line
Pronunciation: (mān'līn", -līn'), [key]
—v., -lined, -lin•ing,
—adj.
—
v.i. Slang.
1. to inject a narcotic, esp. heroin, directly into a vein.
2. to use or enjoy something without restriction:
to mainline on TV movies.
—
v.t. Slang.
1. to inject (a narcotic, esp. heroin) directly into a vein.
2. to use, enjoy, or imbibe (something) without restriction:
mainlining coffee all day long.
—
adj.
having a principal, established, or widely accepted position; major; mainstream:
the membership of mainline churches. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.