| NOUN | communication | warning signal, alarm, alert, alarum | an automatic signal (usually a sound) warning of danger |
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| Meaning | An automatic signal (usually a sound) warning of danger. | |
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| Synonyms | alarm, alert, alarum | |
| Narrower | air alert | The warning signal that begins a period of preparation for an enemy / enemy air attack |
| 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 |
| Spanish | advertencia, alarma, alerta | |
| Catalan | alarma, alerta | |
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