Girna is a Greek word that means "falling." When we talk about girna, we are usually talking about things that fall down or drop from a higher place to a lower place. Girna can refer to many different things, such as a leaf falling from a tree, a ball falling to the ground, or even a person tripping and falling.
When something falls or girna, it is usually because of gravity. Gravity is a force that exists all around us and it pulls everything towards the center of the Earth. That's why when we drop something, it falls down towards the ground.
Sometimes things girna because of other forces, like wind or a push. For example, if someone threw a ball and it hit something, it might bounce back and girna to the ground.
Overall, girna is just a fancy word for something falling down from a higher place to a lower place. It's something that happens all the time, and it's all thanks to gravity!