"threaten" in the verb sense
1. endanger, jeopardize, jeopardise, menace, threaten, imperil, peril
pose a threat to present a danger to
"The pollution is endangering the crops"
to utter intentions of injury or punishment against
"He threatened me when I tried to call the police"
to be a menacing indication of something
"The clouds threaten rain"
Source: WordNet® (An amazing lexical database of English)
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