1. (

• endanger ,
• jeopardize ,
• jeopardise ,
• menace ,
• threaten ,
• imperil ,
• peril

) pose a threat to; present a danger to; "The pollution is endangering the crops" ;

2. (

• threaten

) to utter intentions of injury or punishment against; "He threatened me when I tried to call the police" ;

3. (

• threaten ,

) to be a menacing indication of something; "The clouds threaten rain"; "Danger threatens" ;

1. (

• threatened

) (of flora or fauna) likely in the near future to become endangered; "the spotted owl is a threatened species, not yet an endangered one" ;