don't bet on it

also I wouldn't bet on it

used to tell someone that you think something is unlikely to be true or to happen

当你觉得某事不太可能成真或者发生时，用这个短语来表达;不大可能

A: Do you think they'll give me back the money they owe me?

你认为他们会把欠我的钱还给我吗?

B: I wouldn't bet on it.

我看不见得。