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  1. main line

    • IPA[ˌmān ˈlīn]


    • n.
      a chief railroad line;a chief road or street.
    • v.
      inject (a drug) intravenously
    • noun: main line, plural noun: main lines

    • 釋義


    • 1. a chief railroad line the crash blocked traffic on the main line a mainline station
    • North American a chief road or street.
    • 2. informal a principal vein as a site for a drug injection.


    • 1. inject (a drug) intravenously Mariella mainlines cocaine five times a day he started mainlining on heroin