On a clock, the alarm can be set to go off at a certain time to wake nearby sleepers. You should always check the alarm on the clock at a hotel because a previous guest may have it set to go off in the middle of the night.

The noun alarm refers to a signal that is meant to rouse, alert, or awaken someone. On April 18, 1775, William Dawes, Paul Revere, and several others rode from Boston to Lexington, Massachusetts to raise the alarm that the British were coming. As a verb, alarm means to be filled with anxiety or apprehension. You may become alarmed if your children become too quiet. Never a good sign — they are probably up to something mischievous.

Definitions of alarm
  1. noun
    a device that signals the occurrence of some undesirable event
    synonyms: alarm system, warning device
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    automobile horn, car horn, hooter, horn, motor horn
    a device on an automobile for making a warning noise
    burglar alarm
    a warning device that is tripped off by the occurrence of a burglary
    fire alarm, smoke alarm
    an alarm that is tripped off by fire or smoke
    an alarm device that makes a loud warning sound
    an acoustic device producing a loud often wailing sound as a signal or warning
    air horn
    a pneumatic horn
    a warning device consisting of a horn that generates a loud low tone
    claxon, klaxon
    a kind of loud horn formerly used on motor vehicles
    shofar, shophar
    an ancient musical horn made from the horn of a ram; used in ancient times by the Israelites to sound a warning or a summons; used in synagogues today on solemn occasions
    type of:
    an instrumentality invented for a particular purpose
  2. noun
    an automatic signal (usually a sound) warning of danger
    synonyms: alarum, alert, warning signal
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    a small explosive device that is placed on a railroad track and fires when a train runs over it; the sound of the explosion warns the engineer of danger ahead
    air alert
    the warning signal that begins a period of preparation for an enemy air attack
    burglar alarm
    a loud warning signal produced by a burglar alarm
    fire alarm
    a shout or bell to warn that fire has broken out
    foghorn, fogsignal
    a loud low warning signal that can be heard by fogbound ships
    a noise made by the driver of an automobile to give warning;
    red flag
    a flag that serves as a warning signal
    a warning signal that is a loud wailing sound
    alarm bell, tocsin
    the sound of an alarm (usually a bell)
    type of:
    sign, signal, signaling
    any nonverbal action or gesture that encodes a message
  3. noun
    a clock that wakes a sleeper at some preset time
    synonyms: alarm clock
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    type of:
    a timepiece that shows the time of day
  4. noun
    fear resulting from the awareness of danger
    synonyms: consternation, dismay
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    type of:
    fear, fearfulness, fright
    an emotion experienced in anticipation of some specific pain or danger (usually accompanied by a desire to flee or fight)
  5. verb
    warn or arouse to a sense of danger or call to a state of preparedness
    “The empty house alarmed him”
    synonyms: alert
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    make aware of
    type of:
    notify of danger, potential harm, or risk
  6. verb
    fill with apprehension or alarm; cause to be unpleasantly surprised
    synonyms: appal, appall, dismay, horrify
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    strike with horror or terror
    type of:
    affright, fright, frighten, scare
    cause fear in
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