Threat·en v. t. [imp. & p. p. Threatened p. pr. & vb. n. Threatening.]
  1. To utter threats against; to menace; to inspire with apprehension; to alarm, or attempt to alarm, as with the promise of something evil or disagreeable; to warn.
     Let us straitly threaten them, that they speak henceforth to no man in this name.   --Acts iv. 17.
  2. To exhibit the appearance of (something evil or unpleasant) as approaching; to indicate as impending; to announce the conditional infliction of; as, to threaten war; to threaten death.
  The skies look grimly
  And threaten present blusters.   --Shak.
  Syn: -- To menace.
  Usage: -- Threaten, Menace. Threaten is Anglo-Saxon, and menace is Latin. As often happens, the former is the more familiar term; the latter is more employed in formal style. We are threatened with a drought; the country is menaced with war.
  By turns put on the suppliant and the lord:
  Threatened this moment, and the next implored.   --Prior.
  Of the sharp ax
  Regardless, that o'er his devoted head
  Hangs menacing.   --Somerville.
  threatened
       adj : (of flora or fauna) likely in the near future to become
             endangered; "the spotted owl is a threatened species,
             not yet an endangered one"