threaten

Concise Oxford English Dictionary © 2008 Oxford University Press:
threaten/ˈθretn/

▶verb

• 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.

– derivatives
threatener noun,
threatening adjective,
threateningly adverb.