1 [U] [C] the chance that sb/sth may be hurt, killed or damaged or that sth bad may happen 危险: When he saw the men had knives, he realized his life was in danger. 他一见那几个人拿着刀子，就意识到自己有生命危险。The men kept on running until they thought they were out of danger. 这些男子不停地跑着，直至他们认为已经脱离危险。If things carry on as they are, there's a danger that the factory may have to close. 如果情况照此发展下去，工厂有不得不关门的危险。

2 [C] a danger (to sb/sth) a person or thing that can cause injury, pain or damage to sb 可能引起危险的人或物；威胁: Drunk drivers are a danger to everyone on the road. 喝醉的司机对马路上的每一个人都会构成威胁。