1. (verb) endanger, jeopardize, jeopardise, menace, threaten, imperil, peril
pose a threat to; present a danger to
Synonyms: imperil, stake, threaten, venture, peril, jeopardise, endanger, menace, hazard, jeopardize, scupper, expose, adventure
2. (verb) threaten
to utter intentions of injury or punishment against:"He threatened me when I tried to call the police"
Synonyms: jeopardize, imperil, jeopardise, endanger, peril, menace
3. (verb) threaten
to be a menacing indication of something:"The clouds threaten rain"
Synonyms: jeopardize, imperil, jeopardise, endanger, peril, menace
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Synonyms for threaten 
