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All-red line vs Thin red line vs Thin line

All-red line—(UK hist., also: all-red route) a telegraph line lying throughout in British territory.

  • Green tells of Fleming’s advocacy of a Pacific Cable and the All-Red Line.

Thin red line—(UK)

1. (dated) the British army (used with the implication of its supposed invincibility).

  • Napoleon Bonaparte soon found that in the “thin red line” he had more than met his match.

2. the heroic resistance of few against many.

  • England’s thin red line of intellectual royalists is being overrun by “progressive” reformers who sabotage old-fashioned academic virtues.

Thin line—a significantly blurred borderline between two things.

  • There is often only a thin line between a successful launch and devastating destruction. Rockets are an unforgiving
    technology.

See also: ragged blue line / thin blue line.