mainline

[ meyn-lahyn, -lahyn ]
/ ˈmeɪnˌlaɪn, -ˈlaɪn /

verb (used without object), main·lined, main·lin·ing. Slang.

to inject a narcotic, especially heroin, directly into a vein.
to use or enjoy something without restriction: to mainline on TV movies.

verb (used with object), main·lined, main·lin·ing. Slang.

to inject (a narcotic, especially heroin) directly into a vein.
to use, enjoy, or imbibe (something) without restriction: mainlining coffee all day long.

adjective

having a principal, established, or widely accepted position; major; mainstream: the membership of mainline churches.

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Origin of mainline

1935–40, Americanism; v., adj. use of main line
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

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