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

verb (used without object), mainlined, mainlining. 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), mainlined, mainlining. Slang.
to inject (a narcotic, especially heroin) directly into a vein.
to use, enjoy, or imbibe (something) without restriction:
mainlining coffee all day long.
having a principal, established, or widely accepted position; major; mainstream:
the membership of mainline churches.

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



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