mengancam in English:

The weather is threatening.

The sky had become threatening before I got to the station.

My husband got the hots for a Canadian and is threatening me with divorce.

E-eh? I somehow seem to feel a very threatening aura...

No point in threatening me. I'll still tell you nothing.

Facebook, Twitter, YouTube and Blogger are threatening our life.

The labor unions had been threatening the government with a general strike.

The threatening floods made it necessary to evacuate the town.

Slanderous, defamatory, obscene, indecent, lewd, pornographic, violent, abusive, insulting, threatening and harassing comments are not tolerated.

The mayor's family was harassed with threatening phone calls all day.