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He's been threatening me for months.
The terrorists are threatening to kill the hostages.
One man has been threatened with legal action.
My life has been threatened on several occasions.
the cancer that now threatens his life
Their actions threaten the stability and security of the region.
Many workers feel that their jobs are threatened.
Nuclear testing threatens to destroy our environment.
This is the British English definition of threaten. View American English definition of threaten.
a substance that scientists think exists out in space, but for which they have no direct proof