Noun main line has 1 sense
  1. main line - the principal route of a transportation system
    --1 is a kind of
    path, route, itinerary
,Verb main line has 1 sense
  1. mainline - inject into the vein; "She is mainlining heroin"
    --1 is one way to inject
    Sample sentences:
    Somebody ----s
    Somebody ----s something
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