mainline

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mainline

(mān′līn′)
v. main·lined, main·lining, main·lines Informal
v.tr.
To inject (an illegal or addictive drug, such as heroin) directly into a major vein.
v.intr.
To inject a drug intravenously.

main′lin′er n.

mainline

A regional term most commonly used as a verb in the drug subculture, meaning to inject a drug, usually understood to be illicit (e.g., heroin).

mainline

Drug slang verb To inject a drug