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Alarm A.M.   Spotted Plane Horizon Sirens Started City.‎

Sentence The alarm will go off at six a.m.   Just after he spotted the first plane on the horizon, sirens started to go off around the city.‎
Definition (
intransitive
https://en.wiktionary.org/wiki/Appendix:Glossary#intransitive
) To begin clanging or making
noise
https://en.wiktionary.org/wiki/noise
.

Tags: go, off

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