English → French
main line
A 
, AmE ˌmeɪn ˈlaɪn /
noun
/BrE meɪn ˈlʌɪn Railways grande ligne f
on the main line sur la grande ligne (between entre, from de, to à)
before n [station, terminus, train] de grande ligneB mainline , AmE ˌmeɪn ˈlaɪn /
transitive verb
/BrE meɪn ˈlʌɪn (inject) se shooter à [heroin, cocaine]
C mainline , AmE ˌmeɪn ˈlaɪn /
intransitive verb
/BrE meɪn ˈlʌɪn (inject drug) se piquer