Question

please define it main lines

Answer 1

mainline

 verb

main·​line | \ˈmān-ˈlīn  \

mainlined; mainlining

Medical Definition ofmainline 

(Entry 1 of 2)

transitive verb

slang : to take by or as if by injecting into a principal vein

intransitive verb

slang : to mainline a narcotic drug (as heroin)

main line

 noun

Medical Definition of main line (Entry 2 of 2)

slang

: a principal vein of the circulatory system

HOPE IT HELPS......
MARK AS BRAINLIEST