Being buried is hiding, just like putting things in a warehouse or putting things in a pocket. Being buried in the grave has also played a certain role, but its strength is only 20% of the original, and it has lost 80% of its strength.
For example, the sword used by samurai is cold in the hand and makes people shudder. When put in the sheath, the edge of the sword is gone, but it is still a sword, and it still has a certain deterrent effect, but it is weakened.