<p><strong>Noun</strong></p><ul><li>a sudden fear or distressing suspense caused by an awareness of danger; apprehension; fright.</li><li>Synonyms: panic, terror, consternation.</li><li>any sound, outcry, or information intended to warn of approaching danger: Paul Revere raced through the countryside raising the alarm that the British were coming.</li><li>an automatic device that serves to call attention, to rouse from sleep, or to warn of fire, smoke, an intruder, etc.</li><li>a warning sound; signal for attention.</li><li>Animal Behavior: any sound, outcry, chemical discharge, action, or other signal that functions to draw attention to a potential predator.</li><li>Fencing: an appeal or a challenge made by a step or stamp on the ground with the advancing foot.</li><li>Archaic: a call to arms.</li></ul><p><strong>Verb</strong></p><ul><li>to make fearful or apprehensive; distress.</li><li>to warn of danger; rouse to vigilance and swift measures for safety.</li><li>to fit or equip with an alarm or alarms, as for fire, smoke, or robbery: to alarm one's house and garage.</li></ul>