The dream's meaning depends on the identity of the dead person and on what that person tells you. It could be an affirmation that loving relationships continue beyond the limits of physical life, or it could be nothing more than an expression of your fear of death.
In the Lightning Thief, Poseiden, Percy's dad, talks to him in his dreams.
talks poorly about someone.
Answer them? Talk back?
When someone talks to you, you do best to listen. And give a candid opinion of the topic.
When you have dreams of your dead spouse and he never talks, you might be wishing that you were able to say something final to that person. You might be hoping for a chance to give your dead spouse a message but unconsciously you understand that you are unable to talk to him any more.
chatterbox
chat
tattler.
We cannot control our dreams, and therefore have no control over whether or not we can 'kill' someone in our dreams.
If you want to tell someone "sweet dreams," you can say "fais de beaux rêves."
Gothic
Soliloquoy, but spell check