Adjective threatening has 2 senses
  1. baleful, forbidding, menacing, minacious, minatory, ominous, sinister, threatening, ugly - threatening or foreshadowing evil or tragic developments; "a baleful look"; "forbidding thunderclouds"; "his tone became menacing"; "ominous rumblings of discontent"; "sinister storm clouds"; "a sinister smile"; "his threatening behavior"; "ugly black clouds"; "the situation became ugly"
    Antonym: unalarming (indirect, via alarming)
  2. heavy, lowering, sullen, threatening - darkened by clouds; "a heavy sky"
    Antonym: clear (indirect, via cloudy)
,Verb threaten has 3 senses
  1. endanger, jeopardize, jeopardise, menace, threaten, imperil, peril - pose a threat to; present a danger to; "The pollution is endangering the crops"
    --1 is one way to exist, be
    Sample sentences:
    Something ----s somebody
    Something ----s something
    => Somebody ----s to INFINITIVE
  2. threaten - to utter intentions of injury or punishment against:"He threatened me when I tried to call the police"
    --2 is one way to
    warn
    Sample sentence:
    Sam cannot threaten Sue
  3. threaten - to be a menacing indication of something:"The clouds threaten rain"; "Danger threatens"
    --3 is one way to
    bode, portend, auspicate, prognosticate, omen, presage, betoken, foreshadow, augur, foretell, prefigure, forecast, predict
    Sample sentences:
    Something ----s
    Something ----s something
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