vt.

1. 威胁，恐吓；扬言要[（+with）][+to-v][+that]
   He threatened to call the police.

   他威胁着要叫警察。

2. 预示，是……的征兆；有……的危险[+to-v]
   Dark skies threatened rain.

   天空发黑预示要下雨。

vi.

1. 威胁，恐吓
   I don't mean to threaten.

   我没有威胁的意思。

2. 似将发生，可能来临

v.

1. make or express a threat to (someone) or to do (something).
2. put at risk; endanger.
   ▸(of a situation or the weather) seem likely to produce an unwelcome result:

   the air was raw and threatened rain.