When someone goes out on a limb from a tree, the limb could break and that person would fall to the ground.
We use the expression To go out on a limb to talk about someone who put himself in a dangerous situation.
Everyone went or will go out on a limb because this is life and sooner or later it will make you take a risk to help someone or to get something important to you.
We can also use it to talk about someone who does something which is very different (weird) to other people.
Let’s see some examples :
– There’s no such a thing as a treasure in that island, and I’m not going to go out on a limb with you guys.
– She went out on a limb and saved the day again.