See Also: mainline(dictionary)
mainline 1, adjective(dictionary)
mainline 2, verb(dictionary)
Mainline Physical Therapy(health)

mainline (iou)



mainline verb trans. & intrans. slang (orig. US). M20.
[from main line s.v. MAIN adjective.]
Inject (heroin or another narcotic drug) intravenously, esp. illicitly.
W. Deverell I've seen kids cut those little blue ovals with toot and mainline it. J. Updike You seem like you've snorted or swallowed or mainlined something.
mainliner noun M20.