trunk line

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English

Pronunciation

Noun

trunk line (plural trunk lines)

  1. (rail transport) A main railway line which usually forms the backbone of a rail network.
    Coordinate term: mainline
    • 1987, William H. Rehnquist, The Supreme Court:
      But the states were generally concerned with the location of trunk lines and left it to cities and counties to worry about branch lines.
  2. The main line of a canal, from which other sections diverge.
  3. A main telephone line.
    • 1943, H. Lorna Bingham, The Lost Tribe, Sydney: Winn and Co., page 13, column 2:
      Then he put a trunk line phone call through to the nearest township and asked the Police to send someone out as soon as possible.

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