Dreaming of hiding a corpse is usually because there is a secret that is about to be exposed or a trouble that is difficult to get rid of in real life; Whether it is a secret or a trouble, it is full of lethality, which is enough to make you as anxious and fearful as all suspects in the world.
Sometimes people are killed by you in their dreams, and sometimes bodies come out of nowhere. Perhaps the only difference is that in real life, you are hiding a big secret or someone else is causing a big trouble.