warning signal

Thesaurus

Noun

1.

warning signal - an automatic signal (usually a sound) warning of dangeralarum, alert, alarmtorpedo - 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 aheadsignal, signaling, sign - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"air alert - the warning signal that begins a period of preparation for an enemy air attackburglar alarm - a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"fire alarm - a shout or bell to warn that fire has broken outfoghorn, fogsignal - a loud low warning signal that can be heard by fogbound shipshorn - a noise made by the driver of an automobile to give warning;red flag - a flag that serves as a warning signal; "we didn't swim at the beach because the red flag was up"siren - a warning signal that is a loud wailing soundalarm bell, tocsin - the sound of an alarm (usually a bell)