<p><strong>Noun:</strong></p><ul><li>A sudden fear or distressing suspense caused by an awareness of danger; apprehension; fright.</li><li>Any sound, outcry, or information intended to warn of approaching danger.</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>Any sound, outcry, chemical discharge, action, or other signal that functions to draw attention to a potential predator.</li><li>An appeal or a challenge made by a step or stamp on the ground with the advancing foot.</li><li>A call to arms.</li></ul><p><strong>Verb (used with object):</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.</li></ul>