Threat

Threat:A suggestion that something unpleasant or violent will happen, especially if a particular action or order is not followed.

Usage:
He says he’ll tell the authorities but it’s just an empty threat (= it will not happen).

Excerpts from soaps, novels and films:

Bold and the beautiful

“Ridge: He’s got to leave, Brooke. As long as Phoebe’s here, he can’t be.
Brooke: His truck broke down, he didn’t kidnap Phoebe. Besides she’s only here a couple nights out of the week.

Ridge: You don’t see him as a threat here but I do. I see the way he looks at her, I see the way she looks at him.

Brooke: This is why Rick didn’t want me to tell you they were together, because he knew you would over react.”