warning signal

Noun
  1. An automatic signal (usually a sound) warning of danger (synset 106816015)
    is a type of: sign, signal, signaling - any nonverbal action or gesture that encodes a message
    subtypes:
    • torpedo - a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead
    • air alert - the warning signal that begins a period of preparation for an 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
    • alarm bell, tocsin - the sound of an alarm (usually a bell)
    same as: alarm, alarum, alert

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