inject into the vein
"She is mainlining heroin"
To inject (a drug) directly into a vein.
normal, principal or standard.
Of or pertaining to the principal route or line of a railway
Of or pertaining to a surface railway as distinct from an underground, elevated or light rail one.
Origin: * main + line
The numerical value of mainline in Chaldean Numerology is: 7
The numerical value of mainline in Pythagorean Numerology is: 5
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