alarm

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alarm bell

A sudden warning or intimation of danger, risk, or ill fortune. (Often pluralized.) Alarm bells were going off in my head when I saw the panicked expression on her face.
See also: alarm, bell

cause for alarm

A reason to be worried, frightened, or concerned about something. The X-ray showed a slight discoloration in my lungs, but my doctor assured me it was no cause for alarm. There was cause for alarm when we noticed our boss shredding all the files in her office.
See also: alarm, cause

sound the alarm

1. Literally, to activate an alarm. I think I see smoke coming from the warehouse. Someone run upstairs and sound the alarm!
2. To alert other people about something dangerous, risky, or troublesome. A number of top economic advisors tried to sound the alarm before the economic crash, but no policy makers seemed to heed their warnings.
See also: alarm, sound

raise the alarm

1. Literally, to activate an alarm. I think I see smoke coming from the warehouse. Someone run upstairs and raise the alarm!
2. To alert other people about something dangerous, risky, or troublesome. A number of top economic advisors tried to raise the alarm before the economic crash, but no policy makers seemed to heed their warnings.
See also: alarm, raise

false alarm

A benign situation initially mistaken for an emergency. Mary thought she was going into labor, but it turned out to be a false alarm. When the smoke detectors started beeping, we thought the building was on fire, but it was just a false alarm caused by faulty wiring.
See also: alarm, false

I don't want to alarm you, but

 and I don't want to upset you, but
an expression used to introduce bad or shocking news or gossip. Bill: I don't want to alarm you, but I see someone prowling around your car. Mary: Oh, goodness! I'll call the police! Bob: I don't want to upset you, but I have some bad news. Tom: Let me have it.
See also: alarm, but, want

set off alarm bells

also ring alarm bells
to warn of trouble and the need for action The report about worldwide climate change should sound alarm bells in every community.
See also: alarm, bell, off, set

set (the) alarm bells ringing

if something sets alarm bells ringing, it makes you feel worried because it is a sign that there may be a problem Symptoms which should set alarm bells ringing are often ignored by doctors.
See also: alarm, bell, ring, set

a false alarm

a situation when you think that something bad or dangerous is going to happen but you discover you were wrong Someone called to say there was a bomb inside the building, but it turned out to be a false alarm.
See also: alarm, false

false alarm

A warning signal that is groundless, made either by mistake or as a deliberate deception. For example, The rumor that we were all going to get fired was just a false alarm, or Setting off a false alarm is a criminal offense. This expression, first recorded in 1579, today is often used for a report of a nonexistent fire.
See also: alarm, false

a three-alarm fire

and a five-alarm fire
n. someone or something very exciting. Work was a nightmare today. A five-alarm fire with crisis after crisis.
See also: fire

a five-alarm fire

verb
See also: fire
References in classic literature ?
You can't expect me to find out the moral cause which has alarmed you.
I should like to account first, Miss Halcombe, for the sudden change in Anne Catherick which alarmed them at the farmhouse, hours after she and I had parted, and when time enough had elapsed to quiet any violent agitation that I might have been unfortunate enough to cause.
Don't let the lady be alarmed by my striking a light,' and immediately a match rattled, and glimmered in a hand.
though there's nothing for the lady to be at all alarmed at, still, ladies are apt to take alarm at matters of business--being of that fragile sex that they're not accustomed to them when not of a strictly domestic character--and I do generally make it a rule to propose retirement from the presence of ladies, before entering upon business topics.
Mrs Rokesmith,' resumed her husband, 'is satisfied that she can have no reason for being alarmed, whatever the business is.
Consequently, now that we meet, him and me, you'll say--and say right--that there's nothing to be alarmed at, in my proposing to him TO come forward--or, putting the same meaning in another form, to come along with me--and explain himself.
Case in point: One Harlem apartment resident, Iona Shelley, contacted First Alert[R] recently to tell us that her landlord did not install a CO alarm in her apartment until February, and when it alarmed, he was unaware of how to deal with it properly.
Some animals make different noises when alarmed by a menace approaching on the ground versus a menace from the air.
Expanded summary alarms that support acknowledgement of every individual transition into and out of an alarmed state.
Among the esoteric pleasures of the World Wide Web is a site offering a medley of chirps made by alarmed marmots around the world.