Definition of mainline verb from the Oxford Advanced American Dictionary

 

mainline

 verb
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
 
 
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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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