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warning light
From Wiktionary, the free dictionary
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English
Noun
warning light (plural warning lights)
- A light on a dashboard or control panel that lights up when something undesirable has happened, or is about to happen; or if placed on a tall structure, to warn aircraft of its presence.
- Synonym: idiot light
- 1958 June, “Main-Line Diesel-Electric Locomotives for the Eastern Region”, in Railway Magazine, page 395:
- Additional warning lights are provided to indicate diesel engine shut-down, traction motor blower failure or high engine cooling water temperature. On the assistant's side of the cab, another light shows should the train heating boiler shut down.
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