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English definition of “mainline”

mainline

adjective uk   /ˈmeɪn.laɪn/ us  

mainline adjective (COMMON)

usually US involving beliefs, methods, etc. that are most common: mainline churches the rivalry between catalog companies and mainline stores

mainline adjective (RAILWAY)

relating to an important railway route between large towns or cities: Three mainline railway stations were closed because of bomb threats.

mainline

verb [I or T] uk   /ˈmeɪn.laɪn/ slang us  
to inject (= put into the body through a needle) drugs directly into the blood: Several of her friends were mainlining heroin. By now she was mainlining.
(Definition of mainline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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