main-line

Origin

main line

noun
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.

Origin:
1835–45

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Main-line is always a great word to know.
So is flibbertigibbet. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
a chattering or flighty, light-headed person.
Dictionary.com Unabridged

Main Line

noun
1.
a fashionable residential district west of Philadelphia.
2.
any fashionable district where socially prominent people live.
Main-Line, adjective
Main-Lin·er, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To main-line
Etymonline
Word Origin & History

Main Line
"principal line of a railway," 1841; meaning "affluent area of residence" is 1930s, originally that of Philadelphia, from the "main line" of the Pennsylvania Railroad which added local stops to a string of backwater towns west of the city late 19c. that helped turn them into fashionable suburbs.
Online Etymology Dictionary, © 2010 Douglas Harper
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