I'm not going to leave any stone unturned

What does it mean "I'm not going to allow any stone unturned"?

Thanks
Ish

The expression is "leave no stone unturned." "I'll leave no stone unturned." Meaning the person is going to look everywhere, turn over every rock. The meaning has broadened to mean: I will do everything in my power.

You might like to know that there is a shore bird called the "turnstone." He turns stones, looking for edibles underneath. Actually, the one I'm familiar with is called a "ruddy turnstone." SS