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sia70

Answer:

An alarm system is usually set, so you need something to trigger it. When it is triggered, it has offset, so you say it has gone off. It's the trigger that has gone off. It's not the word , as in the opposite of on.

London2024

Answer:

On is when you set the alarm. It is on until the alarm goes off. Off is when the alarm sounds.

Explanation:

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