Question

what do you mean by hatching of egg

Answer 1

hatching of egg means the coming out of the organism( it could be a bird or any reptile) from an egg

Answer 2

A bird such as a hen that sits on eggs to incubate them can be said to hatch the eggs. Then, when the chick emerges from the egg, you can also say it hatched. Humans don't hatch eggs like birds do, but they can still incubate and then hatch a plan, invention, or idea.