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an anxious awareness of danger:

«…をめぐる/…に対する» (差し迫った)恐れ, おびえ; 不安 «over/at»

e.g. the boat tilted and the boatmen cried out in alarm

e.g. he views the right-wing upsurge in Europe with alarm.

in singular a warning of danger:

e.g. I hammered on several doors to raise the alarm

e.g. Oliver smelled smoke and gave the alarm.

a warning sound or device:

警報; 警報器［装置］; 警告(音)

e.g. they disabled the alarm and used a glass cutter to get in.

an alarm clock.

目覚まし時計(alarm clock)(→ bedroom)

1. with object cause (someone) to feel frightened, disturbed, or in danger:

〈人･物･事が〉〈人〉を驚かせる, 不安にさせる; …に警戒心を起こさせる, …を動揺させる

e.g. the government was alarmed by an outbreak of unrest.

2. (be alarmed) be fitted or protected with an alarm:

e.g. this door is locked and alarmed between 11 p.m. and 6 a.m.

late Middle English (as an exclamation meaning ‘to arms!’): from Old French alarme, from Italian allarme, from all' arme! ‘to arms!’.