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# siren

noun (a siren, sirens)

«siren» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. A device that makes a loud wailing or rising-and-falling sound to warn people, used on ambulances, fire engines and police cars, and for warnings about danger. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#m1)
2. In Greek myths, the Sirens were creatures whose beautiful singing lured sailors onto rocks. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#m2)

### In the lessons

In road safety, when you hear a siren, look around: an emergency vehicle is coming; stay on the pavement and let it pass. Drivers pull over to let it through. Some places have sirens to warn of floods, storms, tornadoes or fires; at school, a siren or alarm means follow the drill. In science, the Doppler effect is why a siren sounds higher as it comes towards you and lower as it goes away. In stories, a siren is a dangerous, tempting singer. Phrases: "hear a siren", "sirens wailing", "a police siren", "tornado siren", "air-raid siren".

### Examples

- We heard a siren and the ambulance raced past. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x1)
- When you hear a siren, stay on the pavement. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x2)
- Cars pulled over for the fire engine with its siren on. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x3)
- The tornado siren sounded across the town. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x4)
- The siren got lower in pitch as the police car drove away. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x5)
- In the myth, the Sirens sang to the sailors. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x6)
- The siren woke the baby. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x7)
- At night we could hear sirens in the city. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/#x8)

### Note

Countable: a siren, sirens. Spelling: s-i-r-e-n. Emergency numbers: 911 (USA, Canada), 999 (UK, Ireland also 112), 000 (Australia), 111 (New Zealand). A siren is a warning, so take it seriously.

## On Mova

- [Trees and pragmatics of «siren» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/S/siren/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«siren» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/siren.html) on Mova free.