If you dreamed of throwing a grenade, your impulsive behavior will lead to embarrassment and humiliation. Any other dream of a grenade is a warning, telling you not to doing anything that goes against your own best judgment.
[1]Images of grenades, as well as bombs and accidents, according to Jung, appear only where the dream represents an actual experience.
It is the attempt of the unconscious to integrate the shock psychologically.
[2]1. Danger is on the way (unexploded).
2. One has some sort of hostility toward someone.
3. One has been badly surprised by something.
[3]A warning given to avert the impending explosive action or accusation
[4]An explosive issue
[5]