I’d put (my) money on something
From Longman Dictionary of Contemporary EnglishI’d put (my) money on somethingI’d put (my) money on somethingspoken used to say that you feel sure that something will happen → moneyExamples from the CorpusI’d put (my) money on something• Even the madmen wouldn't have him in real life, I 'd put money on it.• Personally, I 'd put my money on accidental death without a second thought.