Result from Foreign Dictionaries (2 entries found)
From The Collaborative International Dictionary of English v.0.48 [gcide]:
mainline \main"line`\ (m[=a]n"l[imac]n`) v. t.
1. to inject (illegal drugs) into the vein; as, he preferred
to mainline heroin rather than sniff coke.
From WordNet (r) 3.0 (2006) [wn]:
v 1: inject into the vein; "She is mainlining heroin"
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