A dagger in the dream often indicates an intrusion of a thought, or some personality. It may also simply suggest that you are actually feeling trapped and tormented by thoughts about the future, or about feelings of past hurts which are being remorselessly replayed in your mind over and over again.
The dagger in dreams is a symbolic representation of the inner hurts that need healing. There are ways to understand the symbol of a dagger: some people would consider it to be as hateful and hurtful as it would be viewed in real life; for some, to dream about being stabbed in the back by a dagger portrays an insult or other encounter that should not have happened and one taking offense on their behalf; lastly, a series of bad omens can infer from this mindset, representing danger to the dreamer’s future.