trunk line

== English == === Pronunciation === Rhymes: -aɪn === Noun === trunk line (plural trunk lines) (rail transport) A main railway line which usually forms the backbone of a rail network. Coordinate term: mainline The main line of a canal, from which other sections diverge. A main telephone line. ==== Translations ==== === See also === trunkline === References === “trunk line”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.