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Mayday collapse: an internationally recognized distress signal via radiotelephone (from the French m'aider)

tocsin collapse: a bell used to sound an alarm; the sound of an alarm (usually a bell)

all clear collapse: permission to proceed because obstacles have been removed; a signal (usually a siren) that danger is over

foghorn collapse: a warning device consisting of a horn that generates a loud low tone; a loud low warning signal that can be heard by fogbound ships

alert collapse: a warning serves to make you more alert to danger; condition of heightened watchfulness or preparation for action; "bombers were put on alert during the crisis"; very attentive or observant; "an alert and responsive baby is a joy"; "caught by a couple of alert cops"; "alert enough to spot the opportunity when it came"; "constantly alert and vigilant, like a sentinel on duty"; (usually followed by `to') showing acute awareness; mentally perceptive; "alert to the problems"; "alive to what is going on"; "awake to the dangers of her situation"; "was now awake to the reality of his predicament"; not unconscious; especially having become conscious; "the patient is now awake and alert"; mentally responsive; "an alert mind"

horn collapse: one of the bony outgrowths on the heads of certain ungulates; any hard protuberance from the head of an organism that is similar to or suggestive of a horn; an alarm device that makes a loud warning sound; a high pommel of a Western saddle (usually metal covered with leather); a noisemaker (as at parties or games) that makes a loud noise when you blow through it; a noise made by the driver of an automobile to give warning;; the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails; stab or pierce with a horn or tusk; "the rhino horned the explorer"

siren collapse: eellike aquatic North American salamander with small forelimbs and no hind limbs; have permanent external gills; an acoustic device producing a loud often wailing sound as a signal or warning; a warning signal that is a loud wailing sound; a sea nymph (part woman and part bird) supposed to lure sailors to destruction on the rocks where the nymphs lived; "Odysseus ordered his crew to plug their ears so they would not hear the Siren's fatal song"

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