n.

1. 威胁，恐吓[C][U][+to-v]
2. 构成威胁的人（或事物）[S][（+to）]
   Some people think that machinery is a threat to their jobs.

   一些人认为机器是对他们工作的一种威胁。

3. 凶兆；征兆[S][（+of）]
   The clouds brought a threat of rain.

   阴云带来要下雨的征兆。

n.

1. a statement of an intention to inflict injury, damage, or other hostile action as retribution.
   ▸Law  a menace of bodily harm, such as may restrain a person's freedom of action.
2. a person or thing likely to cause damage or danger.
   ▸the possibility of trouble or danger.