danger zone
US /ˈdeɪn.dʒər ˌzoʊn/
UK /ˈdeɪn.dʒər ˌzoʊn/
1.
an area or situation where there is a high risk of harm, injury, or negative consequences
:
•
The police cordoned off the area, warning everyone to stay out of the danger zone.
•
Financially, the company is entering a danger zone if sales don't improve soon.