Omission in law means not doing something that you are supposed to do by law. It’s kind of like when your parents tell you to clean your room, but you don’t do it. In law, there are rules that people have to follow. If someone doesn’t follow them and doesn’t do what they are supposed to do, it could be considered an omission.
For example, let’s say there is a law that says you have to stop at a red light. If you don’t stop at the red light and you cause an accident, that’s an omission because you didn’t do what the law said you should do.
Sometimes people can also be punished for not doing something even if there isn’t a specific law about it. For example, if a lifeguard sees someone drowning and doesn’t jump in to help, they could be punished because they didn’t do what was expected of them to save a life.
Overall, omission in law means not doing something you should have done by law, and you can get in trouble for it.