a sudden fear or distressing suspense caused by an awareness of danger; apprehension; fright.

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.

an automatic device that serves to call attention, to rouse from sleep, or to warn of fire, smoke, an intruder, etc.

a warning sound; signal for attention.

Animal Behavior . any sound, outcry, chemical discharge, action, or other signal that functions to draw attention to a potential predator.

Fencing . an appeal or a challenge made by a step or stamp on the ground with the advancing foot.

Archaic . a call to arms.

to make fearful or apprehensive; distress.

to warn of danger; rouse to vigilance and swift measures for safety.

to fit or equip with an alarm or alarms, as for fire, smoke, or robbery

to alarm one's house and garage.

noun

assurance , calmness , composure , confidence , peace , quietness , repose , security

verb

assure , calm , gladden , reassure , repose , soothe

noun

anxiety , apprehension , cold feet * , consternation , dismay , distress , dread , fright , horror , nervousness , panic , scare , strain , stress , tension , terror , trepidation , unease , uneasiness , alert , bell , blast , buzzer , call , caution , clock , cry , drum , flap * , flash * , forewarning , gong , high sign * , horn , mayday , nod * , scramble * , scream , shout , sign , signal , siren , sos , squeal , tip , tip off , tocsin , trumpet , warning , whistle , wink * , yell , affright , fearfulness , funk , alarum , awe , consternationtrepidation , disturbance , fear , misgiving , peril , petrification , threat , wonder

verb

amaze , astonish , chill , daunt , dismay , distress , frighten , give a turn , make jump , panic , scare , scare silly , scare stiff , scare to death , spook , startle , surprise , terrify , unnerve , affright , scarify , terrorize , admonish , alert , caution , forewarn , appall , arouse , disquiet , disturb , disturbance , excite , fear , horrify , intimidate , outcry , perturb , petrify , rattle , rouse , shock , stress , threaten , trepidation , upset , warn