Denying an accusation can mean you're feeling:
Guilty
Afraid of accusation
Persecuted or blamed in real life somehow
A need to defend yourself somehow in real life
If someone else denies something you know is true, you may be feeling that they're being dishonest about something in real life.If someone else denies something that you don't know the truth about, you may be guessing or exploring during the dream state to try to gain understanding or clarity.