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