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Verb: mainline  'meyn,lIn
Usage: informal
  1. Inject into the vein
    "She is mainlining heroin"
Noun: main line  meyn lIn
  1. The principal route of a transportation system

Derived forms: mainlines, main lines, mainlining, mainlined

Type of: inject, itinerary, path, route

Encyclopedia: Mainline

Main line