simple past tense and past participle of threaten

(ecology, of a plant or animal) At risk of becoming endangered in the near future. / Feeling insecure or vulnerable.

present participle of threaten

Presenting a threat; menacing; frightening.

An act of threatening; a threat.

Potentially fatal

Third-person singular simple present indicative form of threaten

(US, acronym) Former name of FPCON.

In a threatening manner.

(archaic) second-person singular simple present form of threat