S: (v) threaten (to utter intentions of injury or punishment against) "He threatened me when I tried to call the police"
S: (v) threaten (to be a menacing indication of something) "The clouds threaten rain"; "Danger threatens"
Adjective
S: (adj) 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"