noun fear resulting from the awareness of danger
noun a device that signals the occurrence of some undesirable event
noun an automatic signal (usually a sound) warning of danger
noun a clock that wakes a sleeper at some preset time
Synonymsalarm clock
verb fill with apprehension or alarm; cause to be unpleasantly surprised
verb warn or arouse to a sense of danger or call to a state of preparedness
Synonymsalert
Source: WordNet 3.1, Princeton University