Real Dictionary

threat
A threat is a statement by someone that they will do something unpleasant, especially if you do not do what they want.
variable noun: A threat to a person or thing is a danger that something unpleasant might happen to them. A threat is also the cause of this danger.

threat in American English
an expression of intention to hurt, destroy, punish, etc., as in retaliation or intimidation
to threaten
noun: a declaration of an intention or determination to inflict punishment, injury, etc., in retaliation for, or conditionally upon, some action or course; menace

threat in British English
noun: a declaration of the intention to inflict harm, pain, or misery
verb