Meaning : Pose a threat to. Present a danger to.
Example :
The pollution is endangering the crops.
Synonyms : endanger, imperil, jeopardise, jeopardize, menace, peril
Meaning : To utter intentions of injury or punishment against.
Example :
He threatened me when I tried to call the police.
Meaning : To be a menacing indication of something.
Example :
The clouds threaten rain.
Danger threatens.