threaten

verbs

pose a threat to; present a danger to
"The pollution is endangering the crops"
endanger, imperil, jeopardise, jeopardize, menace, peril, threaten
to utter intentions of injury or punishment against:"He threatened me when I tried to call the police"
threaten
is a type of (narrower)
notify of danger, potential harm, or risk
"The director warned him that he might be fired"; "The doctor warned me about the dangers of smoking"
warn
to be a menacing indication of something:"The clouds threaten rain"
"Danger threatens"
threaten
is a type of (narrower)
indicate by signs
"These signs bode bad news"
augur, auspicate, betoken, bode, forecast, foreshadow, foretell, omen, portend, predict, prefigure, presage, prognosticate