alarm

/əˈlɑːm//əˈlɑɹm/

noun

1
A summons to arms, as on the approach of an enemy.
2
Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
3
A sudden attack; disturbance.
4
Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise.
5
A mechanical device for awaking people, or rousing their attention.
“The clock radio is a friendlier version of the cold alarm by the bedside.”
6
An instance of an alarm ringing, beeping or clanging, to give a noise signal at a certain time.
“You should set the alarm on your watch to go off at seven o'clock.”

1
To call to arms for defense
2
To give (someone) notice of approaching danger
3
To rouse to vigilance and action; to put on the alert.
4
To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
5
To keep in excitement; to disturb.

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