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main line Definition

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main line
verb(main-line)
to take by or as if by injecting into a principal vein
main line
verb(main-line)
to mainline a narcotic drug
main line
adjective(main-line)
being part of an established group; also : being in the mainstream
main line
noun(main-line)
a principal highway or railroad line
main line
noun(main-line)
a principal vein of the circulatory system

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