Pre-alarm

noun
1.
a sudden fear or distressing suspense caused by an awareness of danger; apprehension; fright.
2.
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.
3.
an automatic device that serves to call attention, to rouse from sleep, or to warn of fire, smoke, an intruder, etc.
4.
a warning sound; signal for attention.
5.
Animal Behavior. any sound, outcry, chemical discharge, action, or other signal that functions to draw attention to a potential predator.
6.
Fencing. an appeal or a challenge made by a step or stamp on the ground with the advancing foot.
7.
Archaic. a call to arms.
verb (used with object)
8.
to make fearful or apprehensive; distress.
9.
to warn of danger; rouse to vigilance and swift measures for safety.
10.
to fit or equip with an alarm or alarms, as for fire, smoke, or robbery:
to alarm one’s house and garage.
verb (transitive)
1.
to fill with apprehension, anxiety, or fear
2.
to warn about danger; alert
3.
to fit or activate a burglar alarm on a house, car, etc
noun
4.
fear or terror aroused by awareness of danger; fright
5.
apprehension or uneasiness: the idea of failing filled him with alarm
6.
a noise, signal, etc, warning of danger
7.
any device that transmits such a warning: a burglar alarm
8.

the device in an alarm clock that triggers off the bell or buzzer
short for alarm clock

9.
(archaic) a call to arms
10.
(fencing) a warning or challenge made by stamping the front foot
ALARM
air-launched antiradiation missile

a particular quivering sound of the silver trumpets to give warning to the Hebrews on their journey through the wilderness (Num. 10:5, 6), a call to arms, or a war-note (Jer. 4:19; 49:2; Zeph. 1:16).

see: false alarm