menace in WordNet English dictionary

1. pose a threat to; present a danger to
   "The pollution is endangering the crops"
   endanger  jeopardize  jeopardise  menace  threaten  imperil  peril 
   
2. act in a threatening manner
   "A menacing person"
   menace 
   
3. express a threat either by an utterance or a gesture
   "he menaced the bank manager with a stick"
   menace 
   

1. a threat or the act of threatening
   "he spoke with desperate menace"
   menace 
   
2. something that is a source of danger
   "earthquakes are a constant threat in Japan"
   menace  threat