What does the idiom would be a good bet mean?

The idiom "would be a good bet" means something is likely to happen or be successful. It implies that something is a safe and reliable choice, based on evidence or experience.

Here are some examples:

* "If you're looking for a good restaurant, that new Italian place would be a good bet."

* "Investing in technology stocks would be a good bet for long-term growth."

* "He's been practicing a lot, so I'd say winning the competition would be a good bet for him."

Essentially, "would be a good bet" is a way of saying that you are confident in the outcome of something. It conveys a sense of probability and reliability.