threat

n.

1. 威脅，恐嚇[C][U][+to-v]
2. 構成威脅的人（或事物）[S][（+to）]
   Some people think that machinery is a threat to their jobs.

   一些人認為機器是對他們工作的一種威脅。

3. 凶兆；徵兆[S][（+of）]
   The clouds brought a threat of rain.

   陰雲帶來要下雨的徵兆。