Threaten (verb)

1. Make or express a threat to harm or punish (someone), typically in order to make them do something.
2. Indicate that something unpleasant or damaging is likely to happen.
3. Be a potential source of danger or harm to.
4. Be a warning of (something) to come.

Origin:

Middle english: from old english threátian "to oppress", from threát "oppression, affliction".

Examples:

1. The kidnapper threatened to kill the hostages if his demands were not met.
2. The storm threatens to cause damage to coastal areas.
3. The company is threatened by new competitors.
4. The terrorist threat is threatening the city.
5. The spread of the disease threatens public health.