Warning sound

noun

1. A call to arms

   "… the angry trumpet sounds alarum …"

2. A signal (such as a loud noise or flashing light) that warns or alerts
3. Sudden sharp apprehension and fear resulting from the perception of imminent danger
4. A warning notice

verb

1. To strike with fear
2. Disturb, excite
3. To give warning to
4. To equip with an alarm

noun

1. A clock that can be set to sound an alarm at a desired time

noun

1. The initial reaction of an organism (such as increased hormonal activity) to stress

noun

1. An alarm (such as a fire or burglar alarm) that is set off needlessly
2. Something causing alarm or excitement that proves to be unfounded

noun

1. A fire alarm transmitted (as by telephone call) without sounding the signal apparatus

noun

1. A device that makes a loud noise (such as a ringing sound) if someone tries to enter a building by using force

noun

1. A device that makes a loud sound to warn people when there is a fire

   "Someone set off the fire alarm."

idiom

1. No reason to be worried or afraid

idiom

1. To warn people

   "Economists have raised/sounded the alarm about a possible recession."