to throw caution to the wind，字面意思为把小心、谨慎都抛到九霄云外，引申为：丢掉理性，豁出去了，也就是做事不顾后果，冒险赌一把。例如：Throwing caution to the wind, he decided to ride his motorcycle without a helmet. 他决定豁出去了，不带安全帽就骑摩托。