What is the meaning of threatening?

verb

• Pose a threat to; present a danger to.
  • usage: "The pollution is endangering the crops"
  • synonyms: endanger, jeopardize, jeopardise, menace, threaten, imperil, peril
• (v.) ()
  • synonyms: threaten
• (v.) ()
  • synonyms: threaten

adjective

• Threatening or foreshadowing evil or tragic developments.
  • usage: "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"
  • synonyms: baleful, forbidding, menacing, minacious, minatory, ominous, sinister
• Darkened by clouds.
  • usage: "a heavy sky"
  • synonyms: heavy, lowering, sullen