mainline

[meyn-lahyn, -lahyn] Origin

main·line

[meyn-lahyn, -lahyn] verb, main·lined, main·lin·ing, adjective
verb (used without object) 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) 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.

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Mainline is always a great word to know.
So is top gun. Does it mean:
a person who is the best or one of the best in a particular field; the top-ranked person in a group
a tiresomely disagreeable person
adjective
5.
having a principal, established, or widely accepted position; major; mainstream: the membership of mainline churches.

Origin:
1935–40, Americanism; v., adj. use of main line
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Etymonline
Word Origin & History

mainline
1934, from main line in Amer.Eng. slang sense "principal vein into which drugs can be injected" (1933).
Online Etymology Dictionary, © 2010 Douglas Harper
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