Definitions from Wiktionary ( )

▸ noun:  A summons to arms, as on the approach of an enemy.
▸ noun:  Any sound or information intended to give notice of approaching danger; a warning sound to arouse attention; a warning of danger.
▸ noun:  A sudden attack; disturbance.
▸ noun:  Sudden surprise with fear or terror excited by apprehension of danger; in the military use, commonly, sudden apprehension of being attacked by surprise.
▸ noun:  A mechanical device for awaking people, or rousing their attention.
▸ noun:  An instance of an alarm ringing, beeping or clanging, to give a noise signal at a certain time.
▸ verb:  (transitive) To call to arms for defense.
▸ verb:  (transitive) To give (someone) notice of approaching danger, or necessary action; to rouse to vigilance; to put on the alert.
▸ verb:  (transitive) To surprise with apprehension of danger; to fill with anxiety in regard to threatening evil; to excite with sudden fear.
▸ verb:  (transitive) To keep in excitement; to disturb.

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