mainline verb - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of mainline verb from the Oxford Advanced American Dictionary

mainline

verb

NAmE//ˈmeɪnlaɪn//

[transitive, intransitive] mainline (something) (slang)Verb Forms present simple I / you / we / they mainline

he / she / it mainlines

past simple mainlined

-ing form mainlining

to take an illegal drug by injecting it into a vein At 18 he was mainlining heroin.

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