alarm

Meanings

• fear resulting from the awareness of danger
• a device that signals the occurrence of some undesirable event
• an automatic signal (usually a sound) warning of danger
• a clock that wakes a sleeper at some preset time
• fill with apprehension or alarm; cause to be unpleasantly surprised
• warn or arouse to a sense of danger or call to a state of preparedness
  • "The empty house alarmed him"

Synonyms

alarm clock, alarm system, alarum, alert, appal, appall, consternation, dismay, horrify, warning device, warning signal