to see the red light
Preserved but no longer current.
Meaning · English
To be aware of approach- ing disaster. The phrase comes from the rail- way-signal, where the red light signifies danger.
Era: ca. 1898 (Victorian)
Sources & notes
Reproduced from Brewer’s Dictionary of Phrase and Fable (1898 edition, public domain; archive.org, retrieved 2026-07-31; OCR text, minor errors possible). Reflects the scholarship and attitudes of its era.
Common questions
What does “to see the red light” mean?
To be aware of approach- ing disaster. The phrase comes from the rail- way-signal, where the red light signifies danger.
Is “to see the red light” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.