threat in WordNet English dictionary

1. something that is a source of danger
   "earthquakes are a constant threat in Japan"
   menace  threat 
   
2. a person who inspires fear or dread
   "he was the terror of the neighborhood"
   terror  scourge  threat 
   
3. a warning that something unpleasant is imminent
   "they were under threat of arrest"
   threat 
   
4. declaration of an intention or a determination to inflict harm on another
   "his threat to kill me was quite explicit"
   threat