to do something even though you have been warned about the possible dangers and will have to take responsibility for anything bad that happens自担风险；责任自负
Persons swimming beyond this point do so at their own risk (= on a notice).游泳者越过此界限后果自负。
Valuables are left at their owner's risk (= on a notice).贵重物品须看管，否则风险自负。
The building is unsafe—enter at your own risk.此建筑不安全，进入者后果自负。