If you bet ten dollars on a horse to win, then you have ten dollars riding on that horse.
Extend that to whatever you like.
9 décembre 2011
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It means there is a lot at stake, either money or prestige, depending on an outcome.
9 décembre 2011
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"a lot riding on" means that something is very important, and if that fails, many other things will fail because they depend on it. So for example, if you had a lot riding on passing a test, it means that it's very important to pass that test.
9 décembre 2011
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