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mainline

[meyn-lahyn, -lahyn] /ˈmeɪnˌlaɪn, -ˈlaɪn/
verb (used without object), mainlined, mainlining. Slang.
1.
to inject a narcotic, especially heroin, directly into a vein.
2.
to use or enjoy something without restriction:
to mainline on TV movies.
verb (used with object), mainlined, mainlining. Slang.
3.
to inject (a narcotic, especially heroin) directly into a vein.
4.
to use, enjoy, or imbibe (something) without restriction:
mainlining coffee all day long.
adjective
5.
having a principal, established, or widely accepted position; major; mainstream:
the membership of mainline churches.
Origin of mainline
1935-1940
1935-40, Americanism; v., adj. use of main line
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Word Origin and History for mainline
v.

also main-line, 1934, from main line in American English slang sense "principal vein into which drugs can be injected" (1933).

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for mainline

mainline

verb

  1. To inject narcotics into a blood vessel; shoot up: after mainlining heroin the night before (1930s+ Narcotics)
  2. To take or administer stimulants or depressants of various sorts: because the economy was mainlining bigger and bigger fixes of inflation/ LA and the San Joaquin valley mainlined northern California water and couldn't wait for the next fix
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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