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1.
1.C,U~(to do sth)a statement in which you tell sb that you will punish or harm them, especially if they do not do what you want.

2.U,C, usually sing. the possibility of trouble,danger or disaster.

3.C, usually sing.~(to sth)a person or thing that is likely to cause trouble, danger, etc.
1.Threat (noun)"She is prepared to carry out her threat to resign."

2.Threat (noun)"These ancient woodlands are under threat from new road developments."

3.Threat (noun)
1,"He is unlikely to be a threat to the Spanish."

2,"Drugs pose a major threat to our society."
by Twigy April 10, 2009