What does "red-to-red" mean?

Describing the condition in which two sea-going ships travelling in opposite directions pass each other on their port sides, making their red navigation lights face each other.

Red-to-red

adj

adj ·Rare ·Advanced level

Definitions

Adjective

1
Describing the condition in which two sea-going ships travelling in opposite directions pass each other on their port sides, making their red navigation lights face each other. not-comparable
2
Describing the connection between two batteries' positive terminals, for instance when jump-starting a car. not-comparable

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.