1 [C,U] (a) risk (of sth/that...);(a) risk (to sb/sth) a possibility of sth dangerous or unpleasant happening; a situation that could be dangerous or have a bad result 风险；危险: Don't take any riskswhen you're driving. 驾车时可别冒险。You could drive a car without insurance, but it's not worth the risk. 不买保险也可以开车，但不值得冒这个险。Scientists say these pesticides pose a risk to wildlife. 科学家说，这些杀虫剂对野生生物造成危险。If we don't leave early enough we run the risk of missing the plane. 我们若不及早动身，就可能赶不上那班飞机。Small children are most at risk from the disease. 幼儿最受这种病的威胁。

2 [sing] a person or thing that might cause danger 有可能造成危险的人或物: If he knows your real name he's a security risk. 要是他知道你的真名，就会对你的安全构成威胁。