What is the origin of the idiom "on shaky ground" and when to use it?

The origin of the idiom "on shaky ground" is unclear, but it likely comes from the idea of standing on ground that is not firm or stable, such as on loose soil or an uneven surface. The phrase is often used to describe situations where there is a risk of failure or uncertainty, such as a struggling business or a relationship experiencing problems. It can also be used in personal situations, such as when someone is unsure of their footing or in a dangerous physical situation.