Definitions of alarum

n an automatic signal (usually a sound) warning of danger

alarm, alert, warning signal
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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
a noise made by the driver of an automobile to give warning;
red flag
a flag that serves as a warning signal
a warning signal that is a loud wailing sound
alarm bell, tocsin
the sound of an alarm (usually a bell)
Type of:
sign, signal, signaling
any nonverbal action or gesture that encodes a message

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