A summons to arms, as on the approach of an enemy.
- A sudden fear caused by the realization of danger.
- A warning of existing or approaching danger.
- An electrical, electronic, or mechanical device that serves to warn of danger by means of a sound or signal.
- The sounding mechanism of an alarm clock.
- A call to arms.
- To fill with alarm; frighten. See Synonyms at fear, frighten.
- To give warning to.