English > warning signal: 1 sense > noun 1, communication| Meaning | An automatic signal (usually a sound) warning of danger. |
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| Synonyms | alarm, alert, alarum |
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| Narrower | air alert | The warning signal that begins a period of preparation for an enemy / enemy air attack |
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| burglar alarm | A loud warning signal produced by a burglar alarm |
| fire alarm | A shout or bell to warn that fire has broken out |
| foghorn, fogsignal | A loud low warning signal that can be heard by fogbound ships |
| horn | A noise made by the driver of an automobile to give warning |
| red flag | A flag that serves as a warning signal |
| siren | A warning signal that is a loud wailing sound |
| tocsin, alarm bell | The sound of an alarm (usually a bell) |
| torpedo | A small explosive device that is placed on a railroad track and fires when a train runs over it |
| Broader | signal, signaling, sign | Any nonverbal action or gesture that encodes a message |
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| Spanish | advertencia, alarma, alerta |
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| Catalan | alarma, alerta |
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