vt.

1. 威脅，恐嚇；揚言要[（+with）][+to-v][+that]
   He threatened to call the police.

   他威脅著要叫警察。

2. 預示，是……的徵兆；有……的危險[+to-v]
   Dark skies threatened rain.

   天空發黑預示要下雨。

vi.

1. 威脅，恐嚇
   I don't mean to threaten.

   我沒有威脅的意思。

2. 似將發生，可能來臨

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.