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Signals and equipment used for warning people

alarm

noun

a piece of electrical equipment that warns you of danger, especially by making a loud noise

alarm bell

noun

a bell that rings to warn you of danger

the all clear

noun

the signal or announcement that tells people that a period of danger has ended

beacon

noun

a bright light or fire that shines in the dark and is used as a signal to warn people against danger or to show them the way somewhere

beacon

noun

a tower or floating object with a bright light on it that warns boats that they are near the land

burglar alarm

noun

a piece of equipment that makes a loud noise if someone enters a building while it is switched on

buzzer

noun

a small piece of equipment that buzzes when you press it, used mainly for getting someone’s attention

call

noun

a loud signal played on a musical instrument to tell people to do something

fire alarm

noun

a piece of equipment that makes a loud noise to warn people that there is a fire and that they must leave the building

foghorn

noun

a piece of equipment that makes a loud deep sound as a warning to other ships when there is fog

gong

noun

a large circular metal object hanging from a frame. You hit it to make a loud deep noise.

hooter

noun

a piece of equipment on a car, bicycle etc, that makes a short loud sound that is used as a warning

klaxon

noun

a very loud electric horn or siren

panic button

noun

an object that you press to send a signal to someone, for example the police, to tell them that you need help

siren

noun

a piece of equipment that makes a loud sound, used for warning people

smoke alarm

noun

a piece of equipment that makes a loud noise when there is smoke in a room, used for warning people that there is a fire in the building

smoke detector

noun

a smoke alarm

smoke signal

noun

a signal that consists of clouds of smoke from a fire and can be seen by someone far away

tone

noun

a sound made by a piece of equipment as a signal or warning

whistle

noun

a small metal or plastic object that you put in your mouth and blow to make a high sound

whistle

noun

a piece of equipment that produces a high sound, used as a warning or a signal on a train or a boat, or in a place such as a factory

whistle

noun

a sound made as a signal or a warning, especially on a boat or a train, or in a place such as a factory

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