American English

Definition of mainline verb from the Oxford Advanced American Dictionary



[transitive, intransitive] mainline (something) (slang)Verb Forms present simple I / you / we / they mainline
he / she / it mainlines
past simple mainlined
-ing form mainlining
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to take an illegal drug by injecting it into a vein At 18 he was mainlining heroin.
See the Oxford Advanced Learner's Dictionary entry: mainline

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