Imagine you are playing with your friend and you both have a race to see who can reach the finish line first. But then your friend sneaks behind you and puts a big rock in your shoe while you are not looking.
When you try to run, your foot hurts and you can't move as fast as your friend. This is what we call sabotage. It means someone intentionally tries to stop or ruin something that you are doing.
Sabotage is not a nice thing to do because it can harm someone else's plans or progress. It is important to always be kind and respectful to others and avoid trying to sabotage them.