Simple past tense and past participle of threaten, adjective_ ecology, of a plant or animal At risk of becoming endangered in the near future, Feeling insecure or vulnerable, At risk of becoming extinct or of becoming an endangered species. Used of a plant or animal species

A dream arousing feelings of intense fear, horror, and distress, An oppressed state during sleep, accompanied by a feeling of intense fear, horror, or anxiety, or of inability to escape from some threatened danger or from pursuing phantoms or monsters. Also called incubus, a situation resembling a terrifying dream