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Definition of mainline verb from the Oxford Advanced Learner's Dictionary

mainline

verb
 
/ˈmeɪnlaɪn/
 
/ˈmeɪnlaɪn/
[transitive, intransitive] (slang)
Verb Forms
present simple I / you / we / they mainline
 
/ˈmeɪnlaɪn/
 
/ˈmeɪnlaɪn/
he / she / it mainlines
 
/ˈmeɪnlaɪnz/
 
/ˈmeɪnlaɪnz/
past simple mainlined
 
/ˈmeɪnlaɪnd/
 
/ˈmeɪnlaɪnd/
past participle mainlined
 
/ˈmeɪnlaɪnd/
 
/ˈmeɪnlaɪnd/
-ing form mainlining
 
/ˈmeɪnlaɪnɪŋ/
 
/ˈmeɪnlaɪnɪŋ/
jump to other results
  1. mainline (something) to take an illegal drug by injecting it into a vein
    • At 18 he was mainlining heroin.
See mainline in the Oxford Advanced American Dictionary

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