to invest or risk a lot of money in the belief that something will happen

Global currency markets bet big on the pound remaining weak. 全球货币市场押注于英镑的持续疲软。

to give a lot of support to something or someone, in a way that risks losing money or something else if they are not successful

Sponsors have found that betting big on one athlete is risky. 赞助商发现，只在一名运动员身上孤注一掷是有风险的。