vb, -lined -lin*ing vt , slang : to take by or as if by injecting into a principal vein vi , slang : to mainline a narcotic drug (as heroin) . Similar sounding terms: main line Published under license with Merriam-Webster, Incorporated. © 1997-2024.
vt , slang : to take by or as if by injecting into a principal vein 
